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Finding the Fourth Proportional to 568.95, 783.21 and 421.30

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Solution

The fourth proportional to 568.95, 783.21 and 421.30 is: 579.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.95 : 783.21 = 421.30 : x
  2. Step 2: Convert to fraction form
    568.95/783.21 = 421.30/x
  3. Step 3: Cross multiply
    568.95x = 783.21 × 421.30
  4. Step 4: Simplify right side
    568.95x = 329,966.37
  5. Step 5: Solve for x
    x = 329,966.37/568.95
  6. Step 6: Final answer
    x = 579.96

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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.