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Finding the Fourth Proportional to 568.47, 784.48 and 319.80

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Solution

The fourth proportional to 568.47, 784.48 and 319.80 is: 441.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.47 : 784.48 = 319.80 : x
  2. Step 2: Convert to fraction form
    568.47/784.48 = 319.80/x
  3. Step 3: Cross multiply
    568.47x = 784.48 × 319.80
  4. Step 4: Simplify right side
    568.47x = 250,876.70
  5. Step 5: Solve for x
    x = 250,876.70/568.47
  6. Step 6: Final answer
    x = 441.32

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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.