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Finding the Fourth Proportional to 917.72, 1,375.32 and 429.92

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Solution

The fourth proportional to 917.72, 1,375.32 and 429.92 is: 644.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.72 : 1,375.32 = 429.92 : x
  2. Step 2: Convert to fraction form
    917.72/1,375.32 = 429.92/x
  3. Step 3: Cross multiply
    917.72x = 1,375.32 × 429.92
  4. Step 4: Simplify right side
    917.72x = 591,277.57
  5. Step 5: Solve for x
    x = 591,277.57/917.72
  6. Step 6: Final answer
    x = 644.29

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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.