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Finding the Fourth Proportional to 689.19, 1,032.72 and 515.04

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Solution

The fourth proportional to 689.19, 1,032.72 and 515.04 is: 771.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.19 : 1,032.72 = 515.04 : x
  2. Step 2: Convert to fraction form
    689.19/1,032.72 = 515.04/x
  3. Step 3: Cross multiply
    689.19x = 1,032.72 × 515.04
  4. Step 4: Simplify right side
    689.19x = 531,892.11
  5. Step 5: Solve for x
    x = 531,892.11/689.19
  6. Step 6: Final answer
    x = 771.76

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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.