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Finding the Fourth Proportional to 1,451.91, 2,178.30 and 574.55

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Solution

The fourth proportional to 1,451.91, 2,178.30 and 574.55 is: 861.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.91 : 2,178.30 = 574.55 : x
  2. Step 2: Convert to fraction form
    1,451.91/2,178.30 = 574.55/x
  3. Step 3: Cross multiply
    1,451.91x = 2,178.30 × 574.55
  4. Step 4: Simplify right side
    1,451.91x = 1,251,531.37
  5. Step 5: Solve for x
    x = 1,251,531.37/1,451.91
  6. Step 6: Final answer
    x = 861.99

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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.