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Finding the Fourth Proportional to 917.39, 1,375.67 and 292.57

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Solution

The fourth proportional to 917.39, 1,375.67 and 292.57 is: 438.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.39 : 1,375.67 = 292.57 : x
  2. Step 2: Convert to fraction form
    917.39/1,375.67 = 292.57/x
  3. Step 3: Cross multiply
    917.39x = 1,375.67 × 292.57
  4. Step 4: Simplify right side
    917.39x = 402,475.44
  5. Step 5: Solve for x
    x = 402,475.44/917.39
  6. Step 6: Final answer
    x = 438.72

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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.