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Finding the Fourth Proportional to 100,778.32, 139,027.53 and 64,979.83

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Solution

The fourth proportional to 100,778.32, 139,027.53 and 64,979.83 is: 89,642.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,778.32 : 139,027.53 = 64,979.83 : x
  2. Step 2: Convert to fraction form
    100,778.32/139,027.53 = 64,979.83/x
  3. Step 3: Cross multiply
    100,778.32x = 139,027.53 × 64,979.83
  4. Step 4: Simplify right side
    100,778.32x = 9,033,985,264.72
  5. Step 5: Solve for x
    x = 9,033,985,264.72/100,778.32
  6. Step 6: Final answer
    x = 89,642.15

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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.