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Finding the Fourth Proportional to 282.15, 423.20 and 76.74

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Solution

The fourth proportional to 282.15, 423.20 and 76.74 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.15 : 423.20 = 76.74 : x
  2. Step 2: Convert to fraction form
    282.15/423.20 = 76.74/x
  3. Step 3: Cross multiply
    282.15x = 423.20 × 76.74
  4. Step 4: Simplify right side
    282.15x = 32,476.37
  5. Step 5: Solve for x
    x = 32,476.37/282.15
  6. Step 6: Final answer
    x = 115.10

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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.