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Finding the Fourth Proportional to 917.73, 1,375.65 and 431.19

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Solution

The fourth proportional to 917.73, 1,375.65 and 431.19 is: 646.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.73 : 1,375.65 = 431.19 : x
  2. Step 2: Convert to fraction form
    917.73/1,375.65 = 431.19/x
  3. Step 3: Cross multiply
    917.73x = 1,375.65 × 431.19
  4. Step 4: Simplify right side
    917.73x = 593,166.52
  5. Step 5: Solve for x
    x = 593,166.52/917.73
  6. Step 6: Final answer
    x = 646.34

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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.