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Finding the Fourth Proportional to 93,243.71, 128,724.98 and 72,781.83

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Solution

The fourth proportional to 93,243.71, 128,724.98 and 72,781.83 is: 100,476.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,243.71 : 128,724.98 = 72,781.83 : x
  2. Step 2: Convert to fraction form
    93,243.71/128,724.98 = 72,781.83/x
  3. Step 3: Cross multiply
    93,243.71x = 128,724.98 × 72,781.83
  4. Step 4: Simplify right side
    93,243.71x = 9,368,839,247.20
  5. Step 5: Solve for x
    x = 9,368,839,247.20/93,243.71
  6. Step 6: Final answer
    x = 100,476.91

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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.