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Finding the Fourth Proportional to 688.32, 1,031.62 and 525.48

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Solution

The fourth proportional to 688.32, 1,031.62 and 525.48 is: 787.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.32 : 1,031.62 = 525.48 : x
  2. Step 2: Convert to fraction form
    688.32/1,031.62 = 525.48/x
  3. Step 3: Cross multiply
    688.32x = 1,031.62 × 525.48
  4. Step 4: Simplify right side
    688.32x = 542,095.68
  5. Step 5: Solve for x
    x = 542,095.68/688.32
  6. Step 6: Final answer
    x = 787.56

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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.