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Finding the Fourth Proportional to 99,641.94, 137,428.12 and 63,835.28

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Solution

The fourth proportional to 99,641.94, 137,428.12 and 63,835.28 is: 88,042.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,641.94 : 137,428.12 = 63,835.28 : x
  2. Step 2: Convert to fraction form
    99,641.94/137,428.12 = 63,835.28/x
  3. Step 3: Cross multiply
    99,641.94x = 137,428.12 × 63,835.28
  4. Step 4: Simplify right side
    99,641.94x = 8,772,762,520.07
  5. Step 5: Solve for x
    x = 8,772,762,520.07/99,641.94
  6. Step 6: Final answer
    x = 88,042.87

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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.