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Finding the Fourth Proportional to 49.70, 74.50 and 30.39

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Solution

The fourth proportional to 49.70, 74.50 and 30.39 is: 45.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.70 : 74.50 = 30.39 : x
  2. Step 2: Convert to fraction form
    49.70/74.50 = 30.39/x
  3. Step 3: Cross multiply
    49.70x = 74.50 × 30.39
  4. Step 4: Simplify right side
    49.70x = 2,264.06
  5. Step 5: Solve for x
    x = 2,264.06/49.70
  6. Step 6: Final answer
    x = 45.55

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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.