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Finding the Fourth Proportional to 638.91, 881.19 and 429.03

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Solution

The fourth proportional to 638.91, 881.19 and 429.03 is: 591.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.91 : 881.19 = 429.03 : x
  2. Step 2: Convert to fraction form
    638.91/881.19 = 429.03/x
  3. Step 3: Cross multiply
    638.91x = 881.19 × 429.03
  4. Step 4: Simplify right side
    638.91x = 378,056.95
  5. Step 5: Solve for x
    x = 378,056.95/638.91
  6. Step 6: Final answer
    x = 591.72

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Double scale
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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.