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Finding the Fourth Proportional to 99,138.87, 136,807.86 and 53,815.86

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Solution

The fourth proportional to 99,138.87, 136,807.86 and 53,815.86 is: 74,263.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,138.87 : 136,807.86 = 53,815.86 : x
  2. Step 2: Convert to fraction form
    99,138.87/136,807.86 = 53,815.86/x
  3. Step 3: Cross multiply
    99,138.87x = 136,807.86 × 53,815.86
  4. Step 4: Simplify right side
    99,138.87x = 7,362,432,640.66
  5. Step 5: Solve for x
    x = 7,362,432,640.66/99,138.87
  6. Step 6: Final answer
    x = 74,263.83

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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.