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Finding the Fourth Proportional to 8,705.40, 12,008.16 and 5,167.88

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Solution

The fourth proportional to 8,705.40, 12,008.16 and 5,167.88 is: 7,128.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,705.40 : 12,008.16 = 5,167.88 : x
  2. Step 2: Convert to fraction form
    8,705.40/12,008.16 = 5,167.88/x
  3. Step 3: Cross multiply
    8,705.40x = 12,008.16 × 5,167.88
  4. Step 4: Simplify right side
    8,705.40x = 62,056,729.90
  5. Step 5: Solve for x
    x = 62,056,729.90/8,705.40
  6. Step 6: Final answer
    x = 7,128.53

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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.