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Finding the Fourth Proportional to 282.12, 389.34 and 157.78

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Solution

The fourth proportional to 282.12, 389.34 and 157.78 is: 217.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.12 : 389.34 = 157.78 : x
  2. Step 2: Convert to fraction form
    282.12/389.34 = 157.78/x
  3. Step 3: Cross multiply
    282.12x = 389.34 × 157.78
  4. Step 4: Simplify right side
    282.12x = 61,430.07
  5. Step 5: Solve for x
    x = 61,430.07/282.12
  6. Step 6: Final answer
    x = 217.74

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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.