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Finding the Fourth Proportional to 568.60, 784.58 and 319.90

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Solution

The fourth proportional to 568.60, 784.58 and 319.90 is: 441.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.60 : 784.58 = 319.90 : x
  2. Step 2: Convert to fraction form
    568.60/784.58 = 319.90/x
  3. Step 3: Cross multiply
    568.60x = 784.58 × 319.90
  4. Step 4: Simplify right side
    568.60x = 250,987.14
  5. Step 5: Solve for x
    x = 250,987.14/568.60
  6. Step 6: Final answer
    x = 441.41

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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.