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Finding the Fourth Proportional to 1,031.12, 1,545.04 and 645.56

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Solution

The fourth proportional to 1,031.12, 1,545.04 and 645.56 is: 967.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.12 : 1,545.04 = 645.56 : x
  2. Step 2: Convert to fraction form
    1,031.12/1,545.04 = 645.56/x
  3. Step 3: Cross multiply
    1,031.12x = 1,545.04 × 645.56
  4. Step 4: Simplify right side
    1,031.12x = 997,416.02
  5. Step 5: Solve for x
    x = 997,416.02/1,031.12
  6. Step 6: Final answer
    x = 967.31

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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.