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Finding the Fourth Proportional to 100,656.91, 138,920.01 and 64,950.73

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Solution

The fourth proportional to 100,656.91, 138,920.01 and 64,950.73 is: 89,640.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,656.91 : 138,920.01 = 64,950.73 : x
  2. Step 2: Convert to fraction form
    100,656.91/138,920.01 = 64,950.73/x
  3. Step 3: Cross multiply
    100,656.91x = 138,920.01 × 64,950.73
  4. Step 4: Simplify right side
    100,656.91x = 9,022,956,061.11
  5. Step 5: Solve for x
    x = 9,022,956,061.11/100,656.91
  6. Step 6: Final answer
    x = 89,640.70

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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.