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Finding the Fourth Proportional to 78.54, 116.98 and 74.40

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Solution

The fourth proportional to 78.54, 116.98 and 74.40 is: 110.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.54 : 116.98 = 74.40 : x
  2. Step 2: Convert to fraction form
    78.54/116.98 = 74.40/x
  3. Step 3: Cross multiply
    78.54x = 116.98 × 74.40
  4. Step 4: Simplify right side
    78.54x = 8,703.31
  5. Step 5: Solve for x
    x = 8,703.31/78.54
  6. Step 6: Final answer
    x = 110.81

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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.