Home / 128,819.52-177,776.40-72,230.88

Finding the Fourth Proportional to 128,819.52, 177,776.40 and 72,230.88

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Solution

The fourth proportional to 128,819.52, 177,776.40 and 72,230.88 is: 99,681.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,819.52 : 177,776.40 = 72,230.88 : x
  2. Step 2: Convert to fraction form
    128,819.52/177,776.40 = 72,230.88/x
  3. Step 3: Cross multiply
    128,819.52x = 177,776.40 × 72,230.88
  4. Step 4: Simplify right side
    128,819.52x = 12,840,945,815.23
  5. Step 5: Solve for x
    x = 12,840,945,815.23/128,819.52
  6. Step 6: Final answer
    x = 99,681.68

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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.