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Finding the Fourth Proportional to 282.46, 389.78 and 158.12

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Solution

The fourth proportional to 282.46, 389.78 and 158.12 is: 218.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.46 : 389.78 = 158.12 : x
  2. Step 2: Convert to fraction form
    282.46/389.78 = 158.12/x
  3. Step 3: Cross multiply
    282.46x = 389.78 × 158.12
  4. Step 4: Simplify right side
    282.46x = 61,632.01
  5. Step 5: Solve for x
    x = 61,632.01/282.46
  6. Step 6: Final answer
    x = 218.20

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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.