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Finding the Fourth Proportional to 65.67, 90.61 and 51.81

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Solution

The fourth proportional to 65.67, 90.61 and 51.81 is: 71.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.67 : 90.61 = 51.81 : x
  2. Step 2: Convert to fraction form
    65.67/90.61 = 51.81/x
  3. Step 3: Cross multiply
    65.67x = 90.61 × 51.81
  4. Step 4: Simplify right side
    65.67x = 4,694.50
  5. Step 5: Solve for x
    x = 4,694.50/65.67
  6. Step 6: Final answer
    x = 71.49

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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.