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Finding the Fourth Proportional to 917.32, 1,375.10 and 424.06

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Solution

The fourth proportional to 917.32, 1,375.10 and 424.06 is: 635.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.32 : 1,375.10 = 424.06 : x
  2. Step 2: Convert to fraction form
    917.32/1,375.10 = 424.06/x
  3. Step 3: Cross multiply
    917.32x = 1,375.10 × 424.06
  4. Step 4: Simplify right side
    917.32x = 583,124.91
  5. Step 5: Solve for x
    x = 583,124.91/917.32
  6. Step 6: Final answer
    x = 635.68

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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.