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Finding the Fourth Proportional to 74.80, 112.34 and 71.40

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Solution

The fourth proportional to 74.80, 112.34 and 71.40 is: 107.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.80 : 112.34 = 71.40 : x
  2. Step 2: Convert to fraction form
    74.80/112.34 = 71.40/x
  3. Step 3: Cross multiply
    74.80x = 112.34 × 71.40
  4. Step 4: Simplify right side
    74.80x = 8,021.08
  5. Step 5: Solve for x
    x = 8,021.08/74.80
  6. Step 6: Final answer
    x = 107.23

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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.