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Finding the Fourth Proportional to 568.60, 784.61 and 319.88

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Solution

The fourth proportional to 568.60, 784.61 and 319.88 is: 441.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.60 : 784.61 = 319.88 : x
  2. Step 2: Convert to fraction form
    568.60/784.61 = 319.88/x
  3. Step 3: Cross multiply
    568.60x = 784.61 × 319.88
  4. Step 4: Simplify right side
    568.60x = 250,981.05
  5. Step 5: Solve for x
    x = 250,981.05/568.60
  6. Step 6: Final answer
    x = 441.40

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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.