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Finding the Fourth Proportional to 128,878.80, 177,996.84 and 88,715.76

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Solution

The fourth proportional to 128,878.80, 177,996.84 and 88,715.76 is: 122,526.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878.80 : 177,996.84 = 88,715.76 : x
  2. Step 2: Convert to fraction form
    128,878.80/177,996.84 = 88,715.76/x
  3. Step 3: Cross multiply
    128,878.80x = 177,996.84 × 88,715.76
  4. Step 4: Simplify right side
    128,878.80x = 15,791,124,938.20
  5. Step 5: Solve for x
    x = 15,791,124,938.20/128,878.80
  6. Step 6: Final answer
    x = 122,526.94

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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.