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Finding the Fourth Proportional to 98.15, 147.31 and 52.45

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Solution

The fourth proportional to 98.15, 147.31 and 52.45 is: 78.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.15 : 147.31 = 52.45 : x
  2. Step 2: Convert to fraction form
    98.15/147.31 = 52.45/x
  3. Step 3: Cross multiply
    98.15x = 147.31 × 52.45
  4. Step 4: Simplify right side
    98.15x = 7,725.91
  5. Step 5: Solve for x
    x = 7,725.91/98.15
  6. Step 6: Final answer
    x = 78.72

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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.