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Finding the Fourth Proportional to 98.92, 147.72 and 78.06

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Solution

The fourth proportional to 98.92, 147.72 and 78.06 is: 116.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.92 : 147.72 = 78.06 : x
  2. Step 2: Convert to fraction form
    98.92/147.72 = 78.06/x
  3. Step 3: Cross multiply
    98.92x = 147.72 × 78.06
  4. Step 4: Simplify right side
    98.92x = 11,531.87
  5. Step 5: Solve for x
    x = 11,531.87/98.92
  6. Step 6: Final answer
    x = 116.58

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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.