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Finding the Fourth Proportional to 917.61, 1,375.07 and 723.08

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Solution

The fourth proportional to 917.61, 1,375.07 and 723.08 is: 1,083.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.61 : 1,375.07 = 723.08 : x
  2. Step 2: Convert to fraction form
    917.61/1,375.07 = 723.08/x
  3. Step 3: Cross multiply
    917.61x = 1,375.07 × 723.08
  4. Step 4: Simplify right side
    917.61x = 994,275.12
  5. Step 5: Solve for x
    x = 994,275.12/917.61
  6. Step 6: Final answer
    x = 1,083.55

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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.