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Finding the Fourth Proportional to 142.65, 196.56 and 98.40

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Solution

The fourth proportional to 142.65, 196.56 and 98.40 is: 135.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.65 : 196.56 = 98.40 : x
  2. Step 2: Convert to fraction form
    142.65/196.56 = 98.40/x
  3. Step 3: Cross multiply
    142.65x = 196.56 × 98.40
  4. Step 4: Simplify right side
    142.65x = 19,341.50
  5. Step 5: Solve for x
    x = 19,341.50/142.65
  6. Step 6: Final answer
    x = 135.59

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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.