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Finding the Fourth Proportional to 282.93, 390.42 and 158.61

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Solution

The fourth proportional to 282.93, 390.42 and 158.61 is: 218.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.93 : 390.42 = 158.61 : x
  2. Step 2: Convert to fraction form
    282.93/390.42 = 158.61/x
  3. Step 3: Cross multiply
    282.93x = 390.42 × 158.61
  4. Step 4: Simplify right side
    282.93x = 61,924.52
  5. Step 5: Solve for x
    x = 61,924.52/282.93
  6. Step 6: Final answer
    x = 218.87

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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.