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Finding the Fourth Proportional to 917.01, 1,375.65 and 339.75

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Solution

The fourth proportional to 917.01, 1,375.65 and 339.75 is: 509.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.01 : 1,375.65 = 339.75 : x
  2. Step 2: Convert to fraction form
    917.01/1,375.65 = 339.75/x
  3. Step 3: Cross multiply
    917.01x = 1,375.65 × 339.75
  4. Step 4: Simplify right side
    917.01x = 467,377.09
  5. Step 5: Solve for x
    x = 467,377.09/917.01
  6. Step 6: Final answer
    x = 509.68

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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.