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Finding the Fourth Proportional to 8,689.40, 13,031.70 and 3,141.70

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Solution

The fourth proportional to 8,689.40, 13,031.70 and 3,141.70 is: 4,711.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.40 : 13,031.70 = 3,141.70 : x
  2. Step 2: Convert to fraction form
    8,689.40/13,031.70 = 3,141.70/x
  3. Step 3: Cross multiply
    8,689.40x = 13,031.70 × 3,141.70
  4. Step 4: Simplify right side
    8,689.40x = 40,941,691.89
  5. Step 5: Solve for x
    x = 40,941,691.89/8,689.40
  6. Step 6: Final answer
    x = 4,711.68

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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.