Home / 20,387.17-28,129.80-19,715.19

Finding the Fourth Proportional to 20,387.17, 28,129.80 and 19,715.19

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Solution

The fourth proportional to 20,387.17, 28,129.80 and 19,715.19 is: 27,202.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.17 : 28,129.80 = 19,715.19 : x
  2. Step 2: Convert to fraction form
    20,387.17/28,129.80 = 19,715.19/x
  3. Step 3: Cross multiply
    20,387.17x = 28,129.80 × 19,715.19
  4. Step 4: Simplify right side
    20,387.17x = 554,584,211.01
  5. Step 5: Solve for x
    x = 554,584,211.01/20,387.17
  6. Step 6: Final answer
    x = 27,202.61

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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.