Home / 21,139.13-29,172.63-11,708.57

Finding the Fourth Proportional to 21,139.13, 29,172.63 and 11,708.57

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Solution

The fourth proportional to 21,139.13, 29,172.63 and 11,708.57 is: 16,158.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.13 : 29,172.63 = 11,708.57 : x
  2. Step 2: Convert to fraction form
    21,139.13/29,172.63 = 11,708.57/x
  3. Step 3: Cross multiply
    21,139.13x = 29,172.63 × 11,708.57
  4. Step 4: Simplify right side
    21,139.13x = 341,569,780.44
  5. Step 5: Solve for x
    x = 341,569,780.44/21,139.13
  6. Step 6: Final answer
    x = 16,158.18

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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.