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Finding the Fourth Proportional to 558.76, 769.74 and 392.66

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Solution

The fourth proportional to 558.76, 769.74 and 392.66 is: 540.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.76 : 769.74 = 392.66 : x
  2. Step 2: Convert to fraction form
    558.76/769.74 = 392.66/x
  3. Step 3: Cross multiply
    558.76x = 769.74 × 392.66
  4. Step 4: Simplify right side
    558.76x = 302,246.11
  5. Step 5: Solve for x
    x = 302,246.11/558.76
  6. Step 6: Final answer
    x = 540.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.