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Finding the Fourth Proportional to 917.08, 1,375.76 and 455.11

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Solution

The fourth proportional to 917.08, 1,375.76 and 455.11 is: 682.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.08 : 1,375.76 = 455.11 : x
  2. Step 2: Convert to fraction form
    917.08/1,375.76 = 455.11/x
  3. Step 3: Cross multiply
    917.08x = 1,375.76 × 455.11
  4. Step 4: Simplify right side
    917.08x = 626,122.13
  5. Step 5: Solve for x
    x = 626,122.13/917.08
  6. Step 6: Final answer
    x = 682.73

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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.