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Finding the Fourth Proportional to 917.32, 1,375.05 and 455.43

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Solution

The fourth proportional to 917.32, 1,375.05 and 455.43 is: 682.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.32 : 1,375.05 = 455.43 : x
  2. Step 2: Convert to fraction form
    917.32/1,375.05 = 455.43/x
  3. Step 3: Cross multiply
    917.32x = 1,375.05 × 455.43
  4. Step 4: Simplify right side
    917.32x = 626,239.02
  5. Step 5: Solve for x
    x = 626,239.02/917.32
  6. Step 6: Final answer
    x = 682.69

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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.