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Finding the Fourth Proportional to 501.18, 691.67 and 280.15

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Solution

The fourth proportional to 501.18, 691.67 and 280.15 is: 386.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.18 : 691.67 = 280.15 : x
  2. Step 2: Convert to fraction form
    501.18/691.67 = 280.15/x
  3. Step 3: Cross multiply
    501.18x = 691.67 × 280.15
  4. Step 4: Simplify right side
    501.18x = 193,771.35
  5. Step 5: Solve for x
    x = 193,771.35/501.18
  6. Step 6: Final answer
    x = 386.63

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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.