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Finding the Fourth Proportional to 142.15, 212.06 and 119.47

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Solution

The fourth proportional to 142.15, 212.06 and 119.47 is: 178.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.15 : 212.06 = 119.47 : x
  2. Step 2: Convert to fraction form
    142.15/212.06 = 119.47/x
  3. Step 3: Cross multiply
    142.15x = 212.06 × 119.47
  4. Step 4: Simplify right side
    142.15x = 25,334.81
  5. Step 5: Solve for x
    x = 25,334.81/142.15
  6. Step 6: Final answer
    x = 178.23

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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.