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Finding the Fourth Proportional to 1,353.64, 2,031.05 and 660.91

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Solution

The fourth proportional to 1,353.64, 2,031.05 and 660.91 is: 991.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.64 : 2,031.05 = 660.91 : x
  2. Step 2: Convert to fraction form
    1,353.64/2,031.05 = 660.91/x
  3. Step 3: Cross multiply
    1,353.64x = 2,031.05 × 660.91
  4. Step 4: Simplify right side
    1,353.64x = 1,342,337.95
  5. Step 5: Solve for x
    x = 1,342,337.95/1,353.64
  6. Step 6: Final answer
    x = 991.65

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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.