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Finding the Fourth Proportional to 74.35, 111.48 and 31.05

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Solution

The fourth proportional to 74.35, 111.48 and 31.05 is: 46.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.35 : 111.48 = 31.05 : x
  2. Step 2: Convert to fraction form
    74.35/111.48 = 31.05/x
  3. Step 3: Cross multiply
    74.35x = 111.48 × 31.05
  4. Step 4: Simplify right side
    74.35x = 3,461.34
  5. Step 5: Solve for x
    x = 3,461.34/74.35
  6. Step 6: Final answer
    x = 46.55

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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.