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Finding the Fourth Proportional to 65.06, 89.75 and 40.49

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Solution

The fourth proportional to 65.06, 89.75 and 40.49 is: 55.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.06 : 89.75 = 40.49 : x
  2. Step 2: Convert to fraction form
    65.06/89.75 = 40.49/x
  3. Step 3: Cross multiply
    65.06x = 89.75 × 40.49
  4. Step 4: Simplify right side
    65.06x = 3,633.98
  5. Step 5: Solve for x
    x = 3,633.98/65.06
  6. Step 6: Final answer
    x = 55.86

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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.