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Finding the Fourth Proportional to 589.74, 813.78 and 392.91

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Solution

The fourth proportional to 589.74, 813.78 and 392.91 is: 542.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.74 : 813.78 = 392.91 : x
  2. Step 2: Convert to fraction form
    589.74/813.78 = 392.91/x
  3. Step 3: Cross multiply
    589.74x = 813.78 × 392.91
  4. Step 4: Simplify right side
    589.74x = 319,742.30
  5. Step 5: Solve for x
    x = 319,742.30/589.74
  6. Step 6: Final answer
    x = 542.18

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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.