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Finding the Fourth Proportional to 61.05, 91.39 and 40.50

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Solution

The fourth proportional to 61.05, 91.39 and 40.50 is: 60.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.05 : 91.39 = 40.50 : x
  2. Step 2: Convert to fraction form
    61.05/91.39 = 40.50/x
  3. Step 3: Cross multiply
    61.05x = 91.39 × 40.50
  4. Step 4: Simplify right side
    61.05x = 3,700.74
  5. Step 5: Solve for x
    x = 3,700.74/61.05
  6. Step 6: Final answer
    x = 60.62

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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.