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Finding the Fourth Proportional to 688.85, 1,032.36 and 515.09

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Solution

The fourth proportional to 688.85, 1,032.36 and 515.09 is: 771.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.85 : 1,032.36 = 515.09 : x
  2. Step 2: Convert to fraction form
    688.85/1,032.36 = 515.09/x
  3. Step 3: Cross multiply
    688.85x = 1,032.36 × 515.09
  4. Step 4: Simplify right side
    688.85x = 531,758.31
  5. Step 5: Solve for x
    x = 531,758.31/688.85
  6. Step 6: Final answer
    x = 771.95

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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.