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Finding the Fourth Proportional to 728.01, 1,085.39 and 645.93

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Solution

The fourth proportional to 728.01, 1,085.39 and 645.93 is: 963.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.01 : 1,085.39 = 645.93 : x
  2. Step 2: Convert to fraction form
    728.01/1,085.39 = 645.93/x
  3. Step 3: Cross multiply
    728.01x = 1,085.39 × 645.93
  4. Step 4: Simplify right side
    728.01x = 701,085.96
  5. Step 5: Solve for x
    x = 701,085.96/728.01
  6. Step 6: Final answer
    x = 963.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.