Home / 21,129.10-29,160.15-12,631.25

Finding the Fourth Proportional to 21,129.10, 29,160.15 and 12,631.25

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Solution

The fourth proportional to 21,129.10, 29,160.15 and 12,631.25 is: 17,432.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.10 : 29,160.15 = 12,631.25 : x
  2. Step 2: Convert to fraction form
    21,129.10/29,160.15 = 12,631.25/x
  3. Step 3: Cross multiply
    21,129.10x = 29,160.15 × 12,631.25
  4. Step 4: Simplify right side
    21,129.10x = 368,329,144.69
  5. Step 5: Solve for x
    x = 368,329,144.69/21,129.10
  6. Step 6: Final answer
    x = 17,432.32

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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.