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Finding the Fourth Proportional to 142.95, 214.42 and 61.78

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Solution

The fourth proportional to 142.95, 214.42 and 61.78 is: 92.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.95 : 214.42 = 61.78 : x
  2. Step 2: Convert to fraction form
    142.95/214.42 = 61.78/x
  3. Step 3: Cross multiply
    142.95x = 214.42 × 61.78
  4. Step 4: Simplify right side
    142.95x = 13,246.87
  5. Step 5: Solve for x
    x = 13,246.87/142.95
  6. Step 6: Final answer
    x = 92.67

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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.