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Finding the Fourth Proportional to 281.25, 388.12 and 156.91

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Solution

The fourth proportional to 281.25, 388.12 and 156.91 is: 216.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.25 : 388.12 = 156.91 : x
  2. Step 2: Convert to fraction form
    281.25/388.12 = 156.91/x
  3. Step 3: Cross multiply
    281.25x = 388.12 × 156.91
  4. Step 4: Simplify right side
    281.25x = 60,899.91
  5. Step 5: Solve for x
    x = 60,899.91/281.25
  6. Step 6: Final answer
    x = 216.53

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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.