Home / 21,101.61-29,125.98-13,139.13

Finding the Fourth Proportional to 21,101.61, 29,125.98 and 13,139.13

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Solution

The fourth proportional to 21,101.61, 29,125.98 and 13,139.13 is: 18,135.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,101.61 : 29,125.98 = 13,139.13 : x
  2. Step 2: Convert to fraction form
    21,101.61/29,125.98 = 13,139.13/x
  3. Step 3: Cross multiply
    21,101.61x = 29,125.98 × 13,139.13
  4. Step 4: Simplify right side
    21,101.61x = 382,690,037.60
  5. Step 5: Solve for x
    x = 382,690,037.60/21,101.61
  6. Step 6: Final answer
    x = 18,135.58

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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.