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Finding the Fourth Proportional to 70.10, 105.18 and 31.56

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Solution

The fourth proportional to 70.10, 105.18 and 31.56 is: 47.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.10 : 105.18 = 31.56 : x
  2. Step 2: Convert to fraction form
    70.10/105.18 = 31.56/x
  3. Step 3: Cross multiply
    70.10x = 105.18 × 31.56
  4. Step 4: Simplify right side
    70.10x = 3,319.48
  5. Step 5: Solve for x
    x = 3,319.48/70.10
  6. Step 6: Final answer
    x = 47.35

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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.