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Finding the Fourth Proportional to 727.56, 1,085.20 and 610.64

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Solution

The fourth proportional to 727.56, 1,085.20 and 610.64 is: 910.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.56 : 1,085.20 = 610.64 : x
  2. Step 2: Convert to fraction form
    727.56/1,085.20 = 610.64/x
  3. Step 3: Cross multiply
    727.56x = 1,085.20 × 610.64
  4. Step 4: Simplify right side
    727.56x = 662,666.53
  5. Step 5: Solve for x
    x = 662,666.53/727.56
  6. Step 6: Final answer
    x = 910.81

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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.