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Finding the Fourth Proportional to 61.37, 84.70 and 36.81

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Solution

The fourth proportional to 61.37, 84.70 and 36.81 is: 50.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.37 : 84.70 = 36.81 : x
  2. Step 2: Convert to fraction form
    61.37/84.70 = 36.81/x
  3. Step 3: Cross multiply
    61.37x = 84.70 × 36.81
  4. Step 4: Simplify right side
    61.37x = 3,117.71
  5. Step 5: Solve for x
    x = 3,117.71/61.37
  6. Step 6: Final answer
    x = 50.81

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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.