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Finding the Fourth Proportional to 688.35, 1,031.61 and 514.59

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Solution

The fourth proportional to 688.35, 1,031.61 and 514.59 is: 771.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.35 : 1,031.61 = 514.59 : x
  2. Step 2: Convert to fraction form
    688.35/1,031.61 = 514.59/x
  3. Step 3: Cross multiply
    688.35x = 1,031.61 × 514.59
  4. Step 4: Simplify right side
    688.35x = 530,856.19
  5. Step 5: Solve for x
    x = 530,856.19/688.35
  6. Step 6: Final answer
    x = 771.20

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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.