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Finding the Fourth Proportional to 141.57, 212.31 and 90.18

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Solution

The fourth proportional to 141.57, 212.31 and 90.18 is: 135.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.57 : 212.31 = 90.18 : x
  2. Step 2: Convert to fraction form
    141.57/212.31 = 90.18/x
  3. Step 3: Cross multiply
    141.57x = 212.31 × 90.18
  4. Step 4: Simplify right side
    141.57x = 19,146.12
  5. Step 5: Solve for x
    x = 19,146.12/141.57
  6. Step 6: Final answer
    x = 135.24

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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.