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Finding the Fourth Proportional to 85,005.80, 127,508.70 and 84,487.40

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Solution

The fourth proportional to 85,005.80, 127,508.70 and 84,487.40 is: 126,731.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,005.80 : 127,508.70 = 84,487.40 : x
  2. Step 2: Convert to fraction form
    85,005.80/127,508.70 = 84,487.40/x
  3. Step 3: Cross multiply
    85,005.80x = 127,508.70 × 84,487.40
  4. Step 4: Simplify right side
    85,005.80x = 10,772,878,540.38
  5. Step 5: Solve for x
    x = 10,772,878,540.38/85,005.80
  6. Step 6: Final answer
    x = 126,731.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.