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Finding the Fourth Proportional to 816.60, 1,125.36 and 630.66

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Solution

The fourth proportional to 816.60, 1,125.36 and 630.66 is: 869.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.60 : 1,125.36 = 630.66 : x
  2. Step 2: Convert to fraction form
    816.60/1,125.36 = 630.66/x
  3. Step 3: Cross multiply
    816.60x = 1,125.36 × 630.66
  4. Step 4: Simplify right side
    816.60x = 709,719.54
  5. Step 5: Solve for x
    x = 709,719.54/816.60
  6. Step 6: Final answer
    x = 869.12

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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.