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Finding the Fourth Proportional to 568.96, 784.88 and 391.87

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Solution

The fourth proportional to 568.96, 784.88 and 391.87 is: 540.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.96 : 784.88 = 391.87 : x
  2. Step 2: Convert to fraction form
    568.96/784.88 = 391.87/x
  3. Step 3: Cross multiply
    568.96x = 784.88 × 391.87
  4. Step 4: Simplify right side
    568.96x = 307,570.93
  5. Step 5: Solve for x
    x = 307,570.93/568.96
  6. Step 6: Final answer
    x = 540.58

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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.