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Finding the Fourth Proportional to 47.29, 70.96 and 30.12

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Solution

The fourth proportional to 47.29, 70.96 and 30.12 is: 45.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.29 : 70.96 = 30.12 : x
  2. Step 2: Convert to fraction form
    47.29/70.96 = 30.12/x
  3. Step 3: Cross multiply
    47.29x = 70.96 × 30.12
  4. Step 4: Simplify right side
    47.29x = 2,137.32
  5. Step 5: Solve for x
    x = 2,137.32/47.29
  6. Step 6: Final answer
    x = 45.20

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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.