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Finding the Fourth Proportional to 47.15, 70.70 and 16.70

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Solution

The fourth proportional to 47.15, 70.70 and 16.70 is: 25.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.15 : 70.70 = 16.70 : x
  2. Step 2: Convert to fraction form
    47.15/70.70 = 16.70/x
  3. Step 3: Cross multiply
    47.15x = 70.70 × 16.70
  4. Step 4: Simplify right side
    47.15x = 1,180.69
  5. Step 5: Solve for x
    x = 1,180.69/47.15
  6. Step 6: Final answer
    x = 25.04

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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.