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Finding the Fourth Proportional to 285.36, 427.80 and 140.88

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Solution

The fourth proportional to 285.36, 427.80 and 140.88 is: 211.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.36 : 427.80 = 140.88 : x
  2. Step 2: Convert to fraction form
    285.36/427.80 = 140.88/x
  3. Step 3: Cross multiply
    285.36x = 427.80 × 140.88
  4. Step 4: Simplify right side
    285.36x = 60,268.46
  5. Step 5: Solve for x
    x = 60,268.46/285.36
  6. Step 6: Final answer
    x = 211.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.