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Finding the Fourth Proportional to 66,787.69, 100,158.45 and 19,389.92

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Solution

The fourth proportional to 66,787.69, 100,158.45 and 19,389.92 is: 29,078.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,787.69 : 100,158.45 = 19,389.92 : x
  2. Step 2: Convert to fraction form
    66,787.69/100,158.45 = 19,389.92/x
  3. Step 3: Cross multiply
    66,787.69x = 100,158.45 × 19,389.92
  4. Step 4: Simplify right side
    66,787.69x = 1,942,064,332.82
  5. Step 5: Solve for x
    x = 1,942,064,332.82/66,787.69
  6. Step 6: Final answer
    x = 29,078.18

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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.