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Finding the Fourth Proportional to 99.32, 148.40 and 78.82

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Solution

The fourth proportional to 99.32, 148.40 and 78.82 is: 117.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.32 : 148.40 = 78.82 : x
  2. Step 2: Convert to fraction form
    99.32/148.40 = 78.82/x
  3. Step 3: Cross multiply
    99.32x = 148.40 × 78.82
  4. Step 4: Simplify right side
    99.32x = 11,696.89
  5. Step 5: Solve for x
    x = 11,696.89/99.32
  6. Step 6: Final answer
    x = 117.77

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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.