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Finding the Fourth Proportional to 917.15, 1,375.88 and 454.95

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Solution

The fourth proportional to 917.15, 1,375.88 and 454.95 is: 682.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.15 : 1,375.88 = 454.95 : x
  2. Step 2: Convert to fraction form
    917.15/1,375.88 = 454.95/x
  3. Step 3: Cross multiply
    917.15x = 1,375.88 × 454.95
  4. Step 4: Simplify right side
    917.15x = 625,954.33
  5. Step 5: Solve for x
    x = 625,954.33/917.15
  6. Step 6: Final answer
    x = 682.50

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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.