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Finding the Fourth Proportional to 115.44, 159.40 and 78.58

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Solution

The fourth proportional to 115.44, 159.40 and 78.58 is: 108.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.44 : 159.40 = 78.58 : x
  2. Step 2: Convert to fraction form
    115.44/159.40 = 78.58/x
  3. Step 3: Cross multiply
    115.44x = 159.40 × 78.58
  4. Step 4: Simplify right side
    115.44x = 12,525.65
  5. Step 5: Solve for x
    x = 12,525.65/115.44
  6. Step 6: Final answer
    x = 108.50

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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.