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Finding the Fourth Proportional to 65.44, 90.30 and 40.85

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Solution

The fourth proportional to 65.44, 90.30 and 40.85 is: 56.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.44 : 90.30 = 40.85 : x
  2. Step 2: Convert to fraction form
    65.44/90.30 = 40.85/x
  3. Step 3: Cross multiply
    65.44x = 90.30 × 40.85
  4. Step 4: Simplify right side
    65.44x = 3,688.76
  5. Step 5: Solve for x
    x = 3,688.76/65.44
  6. Step 6: Final answer
    x = 56.37

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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.