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Finding the Fourth Proportional to 91,713.20, 137,569.80 and 56,721.20

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Solution

The fourth proportional to 91,713.20, 137,569.80 and 56,721.20 is: 85,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,713.20 : 137,569.80 = 56,721.20 : x
  2. Step 2: Convert to fraction form
    91,713.20/137,569.80 = 56,721.20/x
  3. Step 3: Cross multiply
    91,713.20x = 137,569.80 × 56,721.20
  4. Step 4: Simplify right side
    91,713.20x = 7,803,124,139.76
  5. Step 5: Solve for x
    x = 7,803,124,139.76/91,713.20
  6. Step 6: Final answer
    x = 85,081.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.