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Finding the Fourth Proportional to 74.28, 111.29 and 45.30

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Solution

The fourth proportional to 74.28, 111.29 and 45.30 is: 67.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.28 : 111.29 = 45.30 : x
  2. Step 2: Convert to fraction form
    74.28/111.29 = 45.30/x
  3. Step 3: Cross multiply
    74.28x = 111.29 × 45.30
  4. Step 4: Simplify right side
    74.28x = 5,041.76
  5. Step 5: Solve for x
    x = 5,041.76/74.28
  6. Step 6: Final answer
    x = 67.88

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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.