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Finding the Fourth Proportional to 1,186.80, 1,781.30 and 602.21

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Solution

The fourth proportional to 1,186.80, 1,781.30 and 602.21 is: 903.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.80 : 1,781.30 = 602.21 : x
  2. Step 2: Convert to fraction form
    1,186.80/1,781.30 = 602.21/x
  3. Step 3: Cross multiply
    1,186.80x = 1,781.30 × 602.21
  4. Step 4: Simplify right side
    1,186.80x = 1,072,721.85
  5. Step 5: Solve for x
    x = 1,072,721.85/1,186.80
  6. Step 6: Final answer
    x = 903.88

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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.