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Finding the Fourth Proportional to 568.68, 782.88 and 421.05

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Solution

The fourth proportional to 568.68, 782.88 and 421.05 is: 579.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.68 : 782.88 = 421.05 : x
  2. Step 2: Convert to fraction form
    568.68/782.88 = 421.05/x
  3. Step 3: Cross multiply
    568.68x = 782.88 × 421.05
  4. Step 4: Simplify right side
    568.68x = 329,631.62
  5. Step 5: Solve for x
    x = 329,631.62/568.68
  6. Step 6: Final answer
    x = 579.64

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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.