Home / 39,890.10-55,048.21-21,985.11

Finding the Fourth Proportional to 39,890.10, 55,048.21 and 21,985.11

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Solution

The fourth proportional to 39,890.10, 55,048.21 and 21,985.11 is: 30,339.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.10 : 55,048.21 = 21,985.11 : x
  2. Step 2: Convert to fraction form
    39,890.10/55,048.21 = 21,985.11/x
  3. Step 3: Cross multiply
    39,890.10x = 55,048.21 × 21,985.11
  4. Step 4: Simplify right side
    39,890.10x = 1,210,240,952.15
  5. Step 5: Solve for x
    x = 1,210,240,952.15/39,890.10
  6. Step 6: Final answer
    x = 30,339.38

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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.