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Finding the Fourth Proportional to 917, 1,375.46 and 454.60

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Solution

The fourth proportional to 917, 1,375.46 and 454.60 is: 681.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    917 : 1,375.46 = 454.60 : x
  2. Step 2: Convert to fraction form
    917/1,375.46 = 454.60/x
  3. Step 3: Cross multiply
    917x = 1,375.46 × 454.60
  4. Step 4: Simplify right side
    917x = 625,284.12
  5. Step 5: Solve for x
    x = 625,284.12/917
  6. Step 6: Final answer
    x = 681.88

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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.