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Finding the Fourth Proportional to 142.56, 196.74 and 77.07

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Solution

The fourth proportional to 142.56, 196.74 and 77.07 is: 106.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.56 : 196.74 = 77.07 : x
  2. Step 2: Convert to fraction form
    142.56/196.74 = 77.07/x
  3. Step 3: Cross multiply
    142.56x = 196.74 × 77.07
  4. Step 4: Simplify right side
    142.56x = 15,162.24
  5. Step 5: Solve for x
    x = 15,162.24/142.56
  6. Step 6: Final answer
    x = 106.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.