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Finding the Fourth Proportional to 61.50, 84.78 and 40.74

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Solution

The fourth proportional to 61.50, 84.78 and 40.74 is: 56.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.50 : 84.78 = 40.74 : x
  2. Step 2: Convert to fraction form
    61.50/84.78 = 40.74/x
  3. Step 3: Cross multiply
    61.50x = 84.78 × 40.74
  4. Step 4: Simplify right side
    61.50x = 3,453.94
  5. Step 5: Solve for x
    x = 3,453.94/61.50
  6. Step 6: Final answer
    x = 56.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.