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Finding the Fourth Proportional to 128,776.72, 177,717.61 and 71,412.20

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Solution

The fourth proportional to 128,776.72, 177,717.61 and 71,412.20 is: 98,552.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,776.72 : 177,717.61 = 71,412.20 : x
  2. Step 2: Convert to fraction form
    128,776.72/177,717.61 = 71,412.20/x
  3. Step 3: Cross multiply
    128,776.72x = 177,717.61 × 71,412.20
  4. Step 4: Simplify right side
    128,776.72x = 12,691,204,620.25
  5. Step 5: Solve for x
    x = 12,691,204,620.25/128,776.72
  6. Step 6: Final answer
    x = 98,552.01

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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.