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Finding the Fourth Proportional to 128,814.87, 177,774.84 and 71,459.85

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Solution

The fourth proportional to 128,814.87, 177,774.84 and 71,459.85 is: 98,620.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,814.87 : 177,774.84 = 71,459.85 : x
  2. Step 2: Convert to fraction form
    128,814.87/177,774.84 = 71,459.85/x
  3. Step 3: Cross multiply
    128,814.87x = 177,774.84 × 71,459.85
  4. Step 4: Simplify right side
    128,814.87x = 12,703,763,400.17
  5. Step 5: Solve for x
    x = 12,703,763,400.17/128,814.87
  6. Step 6: Final answer
    x = 98,620.32

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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.