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Finding the Fourth Proportional to 142.57, 213.90 and 70.38

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Solution

The fourth proportional to 142.57, 213.90 and 70.38 is: 105.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.57 : 213.90 = 70.38 : x
  2. Step 2: Convert to fraction form
    142.57/213.90 = 70.38/x
  3. Step 3: Cross multiply
    142.57x = 213.90 × 70.38
  4. Step 4: Simplify right side
    142.57x = 15,054.28
  5. Step 5: Solve for x
    x = 15,054.28/142.57
  6. Step 6: Final answer
    x = 105.59

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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.