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Finding the Fourth Proportional to 281.76, 388.80 and 157.40

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Solution

The fourth proportional to 281.76, 388.80 and 157.40 is: 217.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.76 : 388.80 = 157.40 : x
  2. Step 2: Convert to fraction form
    281.76/388.80 = 157.40/x
  3. Step 3: Cross multiply
    281.76x = 388.80 × 157.40
  4. Step 4: Simplify right side
    281.76x = 61,197.12
  5. Step 5: Solve for x
    x = 61,197.12/281.76
  6. Step 6: Final answer
    x = 217.20

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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.