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Finding the Fourth Proportional to 996.48, 1,375.68 and 686.40

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Solution

The fourth proportional to 996.48, 1,375.68 and 686.40 is: 947.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.48 : 1,375.68 = 686.40 : x
  2. Step 2: Convert to fraction form
    996.48/1,375.68 = 686.40/x
  3. Step 3: Cross multiply
    996.48x = 1,375.68 × 686.40
  4. Step 4: Simplify right side
    996.48x = 944,266.75
  5. Step 5: Solve for x
    x = 944,266.75/996.48
  6. Step 6: Final answer
    x = 947.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.