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Finding the Fourth Proportional to 282.05, 389.17 and 157.69

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Solution

The fourth proportional to 282.05, 389.17 and 157.69 is: 217.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.05 : 389.17 = 157.69 : x
  2. Step 2: Convert to fraction form
    282.05/389.17 = 157.69/x
  3. Step 3: Cross multiply
    282.05x = 389.17 × 157.69
  4. Step 4: Simplify right side
    282.05x = 61,368.22
  5. Step 5: Solve for x
    x = 61,368.22/282.05
  6. Step 6: Final answer
    x = 217.58

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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.