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Finding the Fourth Proportional to 141.40, 212.10 and 38.70

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Solution

The fourth proportional to 141.40, 212.10 and 38.70 is: 58.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.40 : 212.10 = 38.70 : x
  2. Step 2: Convert to fraction form
    141.40/212.10 = 38.70/x
  3. Step 3: Cross multiply
    141.40x = 212.10 × 38.70
  4. Step 4: Simplify right side
    141.40x = 8,208.27
  5. Step 5: Solve for x
    x = 8,208.27/141.40
  6. Step 6: Final answer
    x = 58.05

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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.