Home / 39,121.32-53,987.22-21,216.76

Finding the Fourth Proportional to 39,121.32, 53,987.22 and 21,216.76

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Solution

The fourth proportional to 39,121.32, 53,987.22 and 21,216.76 is: 29,279.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,121.32 : 53,987.22 = 21,216.76 : x
  2. Step 2: Convert to fraction form
    39,121.32/53,987.22 = 21,216.76/x
  3. Step 3: Cross multiply
    39,121.32x = 53,987.22 × 21,216.76
  4. Step 4: Simplify right side
    39,121.32x = 1,145,433,889.81
  5. Step 5: Solve for x
    x = 1,145,433,889.81/39,121.32
  6. Step 6: Final answer
    x = 29,279.02

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Half scale
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Double scale
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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.