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Finding the Fourth Proportional to 74.80, 112.15 and 34.28

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Solution

The fourth proportional to 74.80, 112.15 and 34.28 is: 51.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.80 : 112.15 = 34.28 : x
  2. Step 2: Convert to fraction form
    74.80/112.15 = 34.28/x
  3. Step 3: Cross multiply
    74.80x = 112.15 × 34.28
  4. Step 4: Simplify right side
    74.80x = 3,844.50
  5. Step 5: Solve for x
    x = 3,844.50/74.80
  6. Step 6: Final answer
    x = 51.40

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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.