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Finding the Fourth Proportional to 282.42, 389.74 and 158.08

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Solution

The fourth proportional to 282.42, 389.74 and 158.08 is: 218.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.42 : 389.74 = 158.08 : x
  2. Step 2: Convert to fraction form
    282.42/389.74 = 158.08/x
  3. Step 3: Cross multiply
    282.42x = 389.74 × 158.08
  4. Step 4: Simplify right side
    282.42x = 61,610.10
  5. Step 5: Solve for x
    x = 61,610.10/282.42
  6. Step 6: Final answer
    x = 218.15

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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.