Home / 128,854.12-177,776.76-72,254.56

Finding the Fourth Proportional to 128,854.12, 177,776.76 and 72,254.56

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Solution

The fourth proportional to 128,854.12, 177,776.76 and 72,254.56 is: 99,687.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,854.12 : 177,776.76 = 72,254.56 : x
  2. Step 2: Convert to fraction form
    128,854.12/177,776.76 = 72,254.56/x
  3. Step 3: Cross multiply
    128,854.12x = 177,776.76 × 72,254.56
  4. Step 4: Simplify right side
    128,854.12x = 12,845,181,572.03
  5. Step 5: Solve for x
    x = 12,845,181,572.03/128,854.12
  6. Step 6: Final answer
    x = 99,687.78

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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.