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Finding the Fourth Proportional to 1,189.20, 1,781.28 and 571.01

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Solution

The fourth proportional to 1,189.20, 1,781.28 and 571.01 is: 855.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.20 : 1,781.28 = 571.01 : x
  2. Step 2: Convert to fraction form
    1,189.20/1,781.28 = 571.01/x
  3. Step 3: Cross multiply
    1,189.20x = 1,781.28 × 571.01
  4. Step 4: Simplify right side
    1,189.20x = 1,017,119.79
  5. Step 5: Solve for x
    x = 1,017,119.79/1,189.20
  6. Step 6: Final answer
    x = 855.30

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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.