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Finding the Fourth Proportional to 574.56, 860.76 and 391.77

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Solution

The fourth proportional to 574.56, 860.76 and 391.77 is: 586.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.56 : 860.76 = 391.77 : x
  2. Step 2: Convert to fraction form
    574.56/860.76 = 391.77/x
  3. Step 3: Cross multiply
    574.56x = 860.76 × 391.77
  4. Step 4: Simplify right side
    574.56x = 337,219.95
  5. Step 5: Solve for x
    x = 337,219.95/574.56
  6. Step 6: Final answer
    x = 586.92

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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.