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Finding the Fourth Proportional to 47.10, 70.60 and 26.78

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Solution

The fourth proportional to 47.10, 70.60 and 26.78 is: 40.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.10 : 70.60 = 26.78 : x
  2. Step 2: Convert to fraction form
    47.10/70.60 = 26.78/x
  3. Step 3: Cross multiply
    47.10x = 70.60 × 26.78
  4. Step 4: Simplify right side
    47.10x = 1,890.67
  5. Step 5: Solve for x
    x = 1,890.67/47.10
  6. Step 6: Final answer
    x = 40.14

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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.