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Finding the Fourth Proportional to 8,111.60, 12,167.40 and 7,042.40

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Solution

The fourth proportional to 8,111.60, 12,167.40 and 7,042.40 is: 10,563.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,111.60 : 12,167.40 = 7,042.40 : x
  2. Step 2: Convert to fraction form
    8,111.60/12,167.40 = 7,042.40/x
  3. Step 3: Cross multiply
    8,111.60x = 12,167.40 × 7,042.40
  4. Step 4: Simplify right side
    8,111.60x = 85,687,697.76
  5. Step 5: Solve for x
    x = 85,687,697.76/8,111.60
  6. Step 6: Final answer
    x = 10,563.60

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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.