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Finding the Fourth Proportional to 74.79, 112.34 and 71.51

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Solution

The fourth proportional to 74.79, 112.34 and 71.51 is: 107.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.79 : 112.34 = 71.51 : x
  2. Step 2: Convert to fraction form
    74.79/112.34 = 71.51/x
  3. Step 3: Cross multiply
    74.79x = 112.34 × 71.51
  4. Step 4: Simplify right side
    74.79x = 8,033.05
  5. Step 5: Solve for x
    x = 8,033.05/74.79
  6. Step 6: Final answer
    x = 107.41

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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.