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Finding the Fourth Proportional to 282.74, 390.12 and 161.45

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Solution

The fourth proportional to 282.74, 390.12 and 161.45 is: 222.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.74 : 390.12 = 161.45 : x
  2. Step 2: Convert to fraction form
    282.74/390.12 = 161.45/x
  3. Step 3: Cross multiply
    282.74x = 390.12 × 161.45
  4. Step 4: Simplify right side
    282.74x = 62,984.87
  5. Step 5: Solve for x
    x = 62,984.87/282.74
  6. Step 6: Final answer
    x = 222.77

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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.