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Finding the Fourth Proportional to 78.19, 117.88 and 74.01

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Solution

The fourth proportional to 78.19, 117.88 and 74.01 is: 111.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.19 : 117.88 = 74.01 : x
  2. Step 2: Convert to fraction form
    78.19/117.88 = 74.01/x
  3. Step 3: Cross multiply
    78.19x = 117.88 × 74.01
  4. Step 4: Simplify right side
    78.19x = 8,724.31
  5. Step 5: Solve for x
    x = 8,724.31/78.19
  6. Step 6: Final answer
    x = 111.57

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.