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Finding the Fourth Proportional to 1,279.98, 1,918.61 and 731.01

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Solution

The fourth proportional to 1,279.98, 1,918.61 and 731.01 is: 1,095.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.98 : 1,918.61 = 731.01 : x
  2. Step 2: Convert to fraction form
    1,279.98/1,918.61 = 731.01/x
  3. Step 3: Cross multiply
    1,279.98x = 1,918.61 × 731.01
  4. Step 4: Simplify right side
    1,279.98x = 1,402,519.44
  5. Step 5: Solve for x
    x = 1,402,519.44/1,279.98
  6. Step 6: Final answer
    x = 1,095.74

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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.