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Finding the Fourth Proportional to 576.20, 861.60 and 430.40

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Solution

The fourth proportional to 576.20, 861.60 and 430.40 is: 643.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.20 : 861.60 = 430.40 : x
  2. Step 2: Convert to fraction form
    576.20/861.60 = 430.40/x
  3. Step 3: Cross multiply
    576.20x = 861.60 × 430.40
  4. Step 4: Simplify right side
    576.20x = 370,832.64
  5. Step 5: Solve for x
    x = 370,832.64/576.20
  6. Step 6: Final answer
    x = 643.58

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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.