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Finding the Fourth Proportional to 282.76, 424.21 and 87.75

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Solution

The fourth proportional to 282.76, 424.21 and 87.75 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.76 : 424.21 = 87.75 : x
  2. Step 2: Convert to fraction form
    282.76/424.21 = 87.75/x
  3. Step 3: Cross multiply
    282.76x = 424.21 × 87.75
  4. Step 4: Simplify right side
    282.76x = 37,224.43
  5. Step 5: Solve for x
    x = 37,224.43/282.76
  6. Step 6: Final answer
    x = 131.65

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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.