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Finding the Fourth Proportional to 21,329.81, 29,432.81 and 15,031.25

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Solution

The fourth proportional to 21,329.81, 29,432.81 and 15,031.25 is: 20,741.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,329.81 : 29,432.81 = 15,031.25 : x
  2. Step 2: Convert to fraction form
    21,329.81/29,432.81 = 15,031.25/x
  3. Step 3: Cross multiply
    21,329.81x = 29,432.81 × 15,031.25
  4. Step 4: Simplify right side
    21,329.81x = 442,411,850.16
  5. Step 5: Solve for x
    x = 442,411,850.16/21,329.81
  6. Step 6: Final answer
    x = 20,741.48

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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.