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Finding the Fourth Proportional to 100,648.48, 138,766.80 and 62,908.96

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Solution

The fourth proportional to 100,648.48, 138,766.80 and 62,908.96 is: 86,734.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,648.48 : 138,766.80 = 62,908.96 : x
  2. Step 2: Convert to fraction form
    100,648.48/138,766.80 = 62,908.96/x
  3. Step 3: Cross multiply
    100,648.48x = 138,766.80 × 62,908.96
  4. Step 4: Simplify right side
    100,648.48x = 8,729,675,070.53
  5. Step 5: Solve for x
    x = 8,729,675,070.53/100,648.48
  6. Step 6: Final answer
    x = 86,734.30

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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.