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Finding the Fourth Proportional to 128,155.77, 176,800.73 and 85,727.97

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Solution

The fourth proportional to 128,155.77, 176,800.73 and 85,727.97 is: 118,268.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,155.77 : 176,800.73 = 85,727.97 : x
  2. Step 2: Convert to fraction form
    128,155.77/176,800.73 = 85,727.97/x
  3. Step 3: Cross multiply
    128,155.77x = 176,800.73 × 85,727.97
  4. Step 4: Simplify right side
    128,155.77x = 15,156,767,248.78
  5. Step 5: Solve for x
    x = 15,156,767,248.78/128,155.77
  6. Step 6: Final answer
    x = 118,268.32

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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.