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Finding the Fourth Proportional to 638.01, 886.55 and 631.26

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Solution

The fourth proportional to 638.01, 886.55 and 631.26 is: 877.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.01 : 886.55 = 631.26 : x
  2. Step 2: Convert to fraction form
    638.01/886.55 = 631.26/x
  3. Step 3: Cross multiply
    638.01x = 886.55 × 631.26
  4. Step 4: Simplify right side
    638.01x = 559,640.40
  5. Step 5: Solve for x
    x = 559,640.40/638.01
  6. Step 6: Final answer
    x = 877.17

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.