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Finding the Fourth Proportional to 501.22, 691.63 and 280.15

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Solution

The fourth proportional to 501.22, 691.63 and 280.15 is: 386.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.22 : 691.63 = 280.15 : x
  2. Step 2: Convert to fraction form
    501.22/691.63 = 280.15/x
  3. Step 3: Cross multiply
    501.22x = 691.63 × 280.15
  4. Step 4: Simplify right side
    501.22x = 193,760.14
  5. Step 5: Solve for x
    x = 193,760.14/501.22
  6. Step 6: Final answer
    x = 386.58

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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.