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Finding the Fourth Proportional to 70.17, 105.21 and 47.39

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Solution

The fourth proportional to 70.17, 105.21 and 47.39 is: 71.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.17 : 105.21 = 47.39 : x
  2. Step 2: Convert to fraction form
    70.17/105.21 = 47.39/x
  3. Step 3: Cross multiply
    70.17x = 105.21 × 47.39
  4. Step 4: Simplify right side
    70.17x = 4,985.44
  5. Step 5: Solve for x
    x = 4,985.44/70.17
  6. Step 6: Final answer
    x = 71.05

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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.