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Finding the Fourth Proportional to 71.46, 106.76 and 70.11

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Solution

The fourth proportional to 71.46, 106.76 and 70.11 is: 104.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.46 : 106.76 = 70.11 : x
  2. Step 2: Convert to fraction form
    71.46/106.76 = 70.11/x
  3. Step 3: Cross multiply
    71.46x = 106.76 × 70.11
  4. Step 4: Simplify right side
    71.46x = 7,484.59
  5. Step 5: Solve for x
    x = 7,484.59/71.46
  6. Step 6: Final answer
    x = 104.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.