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Finding the Fourth Proportional to 686.48, 1,028.52 and 469.28

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Solution

The fourth proportional to 686.48, 1,028.52 and 469.28 is: 703.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.48 : 1,028.52 = 469.28 : x
  2. Step 2: Convert to fraction form
    686.48/1,028.52 = 469.28/x
  3. Step 3: Cross multiply
    686.48x = 1,028.52 × 469.28
  4. Step 4: Simplify right side
    686.48x = 482,663.87
  5. Step 5: Solve for x
    x = 482,663.87/686.48
  6. Step 6: Final answer
    x = 703.10

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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.