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Finding the Fourth Proportional to 77,656.74, 107,140.52 and 63,291.87

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Solution

The fourth proportional to 77,656.74, 107,140.52 and 63,291.87 is: 87,321.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,656.74 : 107,140.52 = 63,291.87 : x
  2. Step 2: Convert to fraction form
    77,656.74/107,140.52 = 63,291.87/x
  3. Step 3: Cross multiply
    77,656.74x = 107,140.52 × 63,291.87
  4. Step 4: Simplify right side
    77,656.74x = 6,781,123,863.57
  5. Step 5: Solve for x
    x = 6,781,123,863.57/77,656.74
  6. Step 6: Final answer
    x = 87,321.77

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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.