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Finding the Fourth Proportional to 90,710.62, 125,137.11 and 78,113.50

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Solution

The fourth proportional to 90,710.62, 125,137.11 and 78,113.50 is: 107,759.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,710.62 : 125,137.11 = 78,113.50 : x
  2. Step 2: Convert to fraction form
    90,710.62/125,137.11 = 78,113.50/x
  3. Step 3: Cross multiply
    90,710.62x = 125,137.11 × 78,113.50
  4. Step 4: Simplify right side
    90,710.62x = 9,774,897,641.99
  5. Step 5: Solve for x
    x = 9,774,897,641.99/90,710.62
  6. Step 6: Final answer
    x = 107,759.13

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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.