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Finding the Fourth Proportional to 917.27, 1,375.97 and 430.19

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Solution

The fourth proportional to 917.27, 1,375.97 and 430.19 is: 645.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.27 : 1,375.97 = 430.19 : x
  2. Step 2: Convert to fraction form
    917.27/1,375.97 = 430.19/x
  3. Step 3: Cross multiply
    917.27x = 1,375.97 × 430.19
  4. Step 4: Simplify right side
    917.27x = 591,919.50
  5. Step 5: Solve for x
    x = 591,919.50/917.27
  6. Step 6: Final answer
    x = 645.31

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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.