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Finding the Fourth Proportional to 86,390.57, 129,981.13 and 51,356.45

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Solution

The fourth proportional to 86,390.57, 129,981.13 and 51,356.45 is: 77,269.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,390.57 : 129,981.13 = 51,356.45 : x
  2. Step 2: Convert to fraction form
    86,390.57/129,981.13 = 51,356.45/x
  3. Step 3: Cross multiply
    86,390.57x = 129,981.13 × 51,356.45
  4. Step 4: Simplify right side
    86,390.57x = 6,675,369,143.03
  5. Step 5: Solve for x
    x = 6,675,369,143.03/86,390.57
  6. Step 6: Final answer
    x = 77,269.65

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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.