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Finding the Fourth Proportional to 44.50, 61.40 and 30.70

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Solution

The fourth proportional to 44.50, 61.40 and 30.70 is: 42.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.50 : 61.40 = 30.70 : x
  2. Step 2: Convert to fraction form
    44.50/61.40 = 30.70/x
  3. Step 3: Cross multiply
    44.50x = 61.40 × 30.70
  4. Step 4: Simplify right side
    44.50x = 1,884.70
  5. Step 5: Solve for x
    x = 1,884.70/44.50
  6. Step 6: Final answer
    x = 42.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.