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Finding the Fourth Proportional to 77,909.58, 107,515.71 and 59,013.90

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Solution

The fourth proportional to 77,909.58, 107,515.71 and 59,013.90 is: 81,439.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,909.58 : 107,515.71 = 59,013.90 : x
  2. Step 2: Convert to fraction form
    77,909.58/107,515.71 = 59,013.90/x
  3. Step 3: Cross multiply
    77,909.58x = 107,515.71 × 59,013.90
  4. Step 4: Simplify right side
    77,909.58x = 6,344,921,358.37
  5. Step 5: Solve for x
    x = 6,344,921,358.37/77,909.58
  6. Step 6: Final answer
    x = 81,439.55

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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.