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Finding the Fourth Proportional to 638.60, 875.62 and 576.19

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Solution

The fourth proportional to 638.60, 875.62 and 576.19 is: 790.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.60 : 875.62 = 576.19 : x
  2. Step 2: Convert to fraction form
    638.60/875.62 = 576.19/x
  3. Step 3: Cross multiply
    638.60x = 875.62 × 576.19
  4. Step 4: Simplify right side
    638.60x = 504,519.11
  5. Step 5: Solve for x
    x = 504,519.11/638.60
  6. Step 6: Final answer
    x = 790.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.