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Finding the Fourth Proportional to 910.62, 1,255.84 and 723.80

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Solution

The fourth proportional to 910.62, 1,255.84 and 723.80 is: 998.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.62 : 1,255.84 = 723.80 : x
  2. Step 2: Convert to fraction form
    910.62/1,255.84 = 723.80/x
  3. Step 3: Cross multiply
    910.62x = 1,255.84 × 723.80
  4. Step 4: Simplify right side
    910.62x = 908,978.32
  5. Step 5: Solve for x
    x = 908,978.32/910.62
  6. Step 6: Final answer
    x = 998.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.