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Finding the Fourth Proportional to 128,689.95, 177,592.16 and 72,101.79

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Solution

The fourth proportional to 128,689.95, 177,592.16 and 72,101.79 is: 99,500.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,689.95 : 177,592.16 = 72,101.79 : x
  2. Step 2: Convert to fraction form
    128,689.95/177,592.16 = 72,101.79/x
  3. Step 3: Cross multiply
    128,689.95x = 177,592.16 × 72,101.79
  4. Step 4: Simplify right side
    128,689.95x = 12,804,712,265.46
  5. Step 5: Solve for x
    x = 12,804,712,265.46/128,689.95
  6. Step 6: Final answer
    x = 99,500.48

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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.