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Finding the Fourth Proportional to 917.10, 1,375.65 and 528.30

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Solution

The fourth proportional to 917.10, 1,375.65 and 528.30 is: 792.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.10 : 1,375.65 = 528.30 : x
  2. Step 2: Convert to fraction form
    917.10/1,375.65 = 528.30/x
  3. Step 3: Cross multiply
    917.10x = 1,375.65 × 528.30
  4. Step 4: Simplify right side
    917.10x = 726,755.90
  5. Step 5: Solve for x
    x = 726,755.90/917.10
  6. Step 6: Final answer
    x = 792.45

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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.