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Finding the Fourth Proportional to 142.30, 211.90 and 141.70

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Solution

The fourth proportional to 142.30, 211.90 and 141.70 is: 211.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.30 : 211.90 = 141.70 : x
  2. Step 2: Convert to fraction form
    142.30/211.90 = 141.70/x
  3. Step 3: Cross multiply
    142.30x = 211.90 × 141.70
  4. Step 4: Simplify right side
    142.30x = 30,026.23
  5. Step 5: Solve for x
    x = 30,026.23/142.30
  6. Step 6: Final answer
    x = 211.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.