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Finding the Fourth Proportional to 140.30, 210.31 and 88.79

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Solution

The fourth proportional to 140.30, 210.31 and 88.79 is: 133.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.30 : 210.31 = 88.79 : x
  2. Step 2: Convert to fraction form
    140.30/210.31 = 88.79/x
  3. Step 3: Cross multiply
    140.30x = 210.31 × 88.79
  4. Step 4: Simplify right side
    140.30x = 18,673.12
  5. Step 5: Solve for x
    x = 18,673.12/140.30
  6. Step 6: Final answer
    x = 133.10

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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.