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Finding the Fourth Proportional to 61.18, 91.78 and 43.11

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Solution

The fourth proportional to 61.18, 91.78 and 43.11 is: 64.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.18 : 91.78 = 43.11 : x
  2. Step 2: Convert to fraction form
    61.18/91.78 = 43.11/x
  3. Step 3: Cross multiply
    61.18x = 91.78 × 43.11
  4. Step 4: Simplify right side
    61.18x = 3,956.53
  5. Step 5: Solve for x
    x = 3,956.53/61.18
  6. Step 6: Final answer
    x = 64.67

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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.