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Finding the Fourth Proportional to 574.90, 861.44 and 420.59

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Solution

The fourth proportional to 574.90, 861.44 and 420.59 is: 630.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.90 : 861.44 = 420.59 : x
  2. Step 2: Convert to fraction form
    574.90/861.44 = 420.59/x
  3. Step 3: Cross multiply
    574.90x = 861.44 × 420.59
  4. Step 4: Simplify right side
    574.90x = 362,313.10
  5. Step 5: Solve for x
    x = 362,313.10/574.90
  6. Step 6: Final answer
    x = 630.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.