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Finding the Fourth Proportional to 282.98, 390.62 and 189.70

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Solution

The fourth proportional to 282.98, 390.62 and 189.70 is: 261.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.98 : 390.62 = 189.70 : x
  2. Step 2: Convert to fraction form
    282.98/390.62 = 189.70/x
  3. Step 3: Cross multiply
    282.98x = 390.62 × 189.70
  4. Step 4: Simplify right side
    282.98x = 74,100.61
  5. Step 5: Solve for x
    x = 74,100.61/282.98
  6. Step 6: Final answer
    x = 261.86

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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.