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Finding the Fourth Proportional to 128,897.68, 177,866.85 and 72,298.12

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Solution

The fourth proportional to 128,897.68, 177,866.85 and 72,298.12 is: 99,764.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,897.68 : 177,866.85 = 72,298.12 : x
  2. Step 2: Convert to fraction form
    128,897.68/177,866.85 = 72,298.12/x
  3. Step 3: Cross multiply
    128,897.68x = 177,866.85 × 72,298.12
  4. Step 4: Simplify right side
    128,897.68x = 12,859,438,865.32
  5. Step 5: Solve for x
    x = 12,859,438,865.32/128,897.68
  6. Step 6: Final answer
    x = 99,764.70

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1.5x scale

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.