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Finding the Fourth Proportional to 99,078.58, 136,724.11 and 56,639.85

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Solution

The fourth proportional to 99,078.58, 136,724.11 and 56,639.85 is: 78,160.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,078.58 : 136,724.11 = 56,639.85 : x
  2. Step 2: Convert to fraction form
    99,078.58/136,724.11 = 56,639.85/x
  3. Step 3: Cross multiply
    99,078.58x = 136,724.11 × 56,639.85
  4. Step 4: Simplify right side
    99,078.58x = 7,744,033,081.78
  5. Step 5: Solve for x
    x = 7,744,033,081.78/99,078.58
  6. Step 6: Final answer
    x = 78,160.52

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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.