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Finding the Fourth Proportional to 486.74, 731.01 and 405.74

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Solution

The fourth proportional to 486.74, 731.01 and 405.74 is: 609.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.74 : 731.01 = 405.74 : x
  2. Step 2: Convert to fraction form
    486.74/731.01 = 405.74/x
  3. Step 3: Cross multiply
    486.74x = 731.01 × 405.74
  4. Step 4: Simplify right side
    486.74x = 296,600.00
  5. Step 5: Solve for x
    x = 296,600.00/486.74
  6. Step 6: Final answer
    x = 609.36

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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.