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Finding the Fourth Proportional to 1,010.55, 1,393.80 and 731.70

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Solution

The fourth proportional to 1,010.55, 1,393.80 and 731.70 is: 1,009.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.55 : 1,393.80 = 731.70 : x
  2. Step 2: Convert to fraction form
    1,010.55/1,393.80 = 731.70/x
  3. Step 3: Cross multiply
    1,010.55x = 1,393.80 × 731.70
  4. Step 4: Simplify right side
    1,010.55x = 1,019,843.46
  5. Step 5: Solve for x
    x = 1,019,843.46/1,010.55
  6. Step 6: Final answer
    x = 1,009.20

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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.