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Finding the Fourth Proportional to 568.66, 784.33 and 391.68

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Solution

The fourth proportional to 568.66, 784.33 and 391.68 is: 540.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.66 : 784.33 = 391.68 : x
  2. Step 2: Convert to fraction form
    568.66/784.33 = 391.68/x
  3. Step 3: Cross multiply
    568.66x = 784.33 × 391.68
  4. Step 4: Simplify right side
    568.66x = 307,206.86
  5. Step 5: Solve for x
    x = 307,206.86/568.66
  6. Step 6: Final answer
    x = 540.23

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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.