Home / 128,689.20-177,591.12-72,101.04

Finding the Fourth Proportional to 128,689.20, 177,591.12 and 72,101.04

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Solution

The fourth proportional to 128,689.20, 177,591.12 and 72,101.04 is: 99,499.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,689.20 : 177,591.12 = 72,101.04 : x
  2. Step 2: Convert to fraction form
    128,689.20/177,591.12 = 72,101.04/x
  3. Step 3: Cross multiply
    128,689.20x = 177,591.12 × 72,101.04
  4. Step 4: Simplify right side
    128,689.20x = 12,804,504,446.76
  5. Step 5: Solve for x
    x = 12,804,504,446.76/128,689.20
  6. Step 6: Final answer
    x = 99,499.45

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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.