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Finding the Fourth Proportional to 128,239, 176,969.82 and 71,655.64

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Solution

The fourth proportional to 128,239, 176,969.82 and 71,655.64 is: 98,884.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239 : 176,969.82 = 71,655.64 : x
  2. Step 2: Convert to fraction form
    128,239/176,969.82 = 71,655.64/x
  3. Step 3: Cross multiply
    128,239x = 176,969.82 × 71,655.64
  4. Step 4: Simplify right side
    128,239x = 12,680,885,712.78
  5. Step 5: Solve for x
    x = 12,680,885,712.78/128,239
  6. Step 6: Final answer
    x = 98,884.78

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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.