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Finding the Fourth Proportional to 282.61, 389.99 and 158.28

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Solution

The fourth proportional to 282.61, 389.99 and 158.28 is: 218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.61 : 389.99 = 158.28 : x
  2. Step 2: Convert to fraction form
    282.61/389.99 = 158.28/x
  3. Step 3: Cross multiply
    282.61x = 389.99 × 158.28
  4. Step 4: Simplify right side
    282.61x = 61,728.01
  5. Step 5: Solve for x
    x = 61,728.01/282.61
  6. Step 6: Final answer
    x = 218.42

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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.