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Finding the Fourth Proportional to 568.98, 785.20 and 320.30

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Solution

The fourth proportional to 568.98, 785.20 and 320.30 is: 442.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.98 : 785.20 = 320.30 : x
  2. Step 2: Convert to fraction form
    568.98/785.20 = 320.30/x
  3. Step 3: Cross multiply
    568.98x = 785.20 × 320.30
  4. Step 4: Simplify right side
    568.98x = 251,499.56
  5. Step 5: Solve for x
    x = 251,499.56/568.98
  6. Step 6: Final answer
    x = 442.02

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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.