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Finding the Fourth Proportional to 78.44, 117.54 and 55.65

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Solution

The fourth proportional to 78.44, 117.54 and 55.65 is: 83.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.44 : 117.54 = 55.65 : x
  2. Step 2: Convert to fraction form
    78.44/117.54 = 55.65/x
  3. Step 3: Cross multiply
    78.44x = 117.54 × 55.65
  4. Step 4: Simplify right side
    78.44x = 6,541.33
  5. Step 5: Solve for x
    x = 6,541.33/78.44
  6. Step 6: Final answer
    x = 83.40

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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.