Home / 39,216.18-54,117.41-21,987.40

Finding the Fourth Proportional to 39,216.18, 54,117.41 and 21,987.40

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Solution

The fourth proportional to 39,216.18, 54,117.41 and 21,987.40 is: 30,342.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,216.18 : 54,117.41 = 21,987.40 : x
  2. Step 2: Convert to fraction form
    39,216.18/54,117.41 = 21,987.40/x
  3. Step 3: Cross multiply
    39,216.18x = 54,117.41 × 21,987.40
  4. Step 4: Simplify right side
    39,216.18x = 1,189,901,105.09
  5. Step 5: Solve for x
    x = 1,189,901,105.09/39,216.18
  6. Step 6: Final answer
    x = 30,342.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.