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Finding the Fourth Proportional to 75.33, 112.20 and 70.31

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Solution

The fourth proportional to 75.33, 112.20 and 70.31 is: 104.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.33 : 112.20 = 70.31 : x
  2. Step 2: Convert to fraction form
    75.33/112.20 = 70.31/x
  3. Step 3: Cross multiply
    75.33x = 112.20 × 70.31
  4. Step 4: Simplify right side
    75.33x = 7,888.43
  5. Step 5: Solve for x
    x = 7,888.43/75.33
  6. Step 6: Final answer
    x = 104.73

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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.