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Finding the Fourth Proportional to 628.01, 865.87 and 403.55

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Solution

The fourth proportional to 628.01, 865.87 and 403.55 is: 556.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.01 : 865.87 = 403.55 : x
  2. Step 2: Convert to fraction form
    628.01/865.87 = 403.55/x
  3. Step 3: Cross multiply
    628.01x = 865.87 × 403.55
  4. Step 4: Simplify right side
    628.01x = 349,419.75
  5. Step 5: Solve for x
    x = 349,419.75/628.01
  6. Step 6: Final answer
    x = 556.39

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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.