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Finding the Fourth Proportional to 65.20, 90.04 and 40.66

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Solution

The fourth proportional to 65.20, 90.04 and 40.66 is: 56.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.20 : 90.04 = 40.66 : x
  2. Step 2: Convert to fraction form
    65.20/90.04 = 40.66/x
  3. Step 3: Cross multiply
    65.20x = 90.04 × 40.66
  4. Step 4: Simplify right side
    65.20x = 3,661.03
  5. Step 5: Solve for x
    x = 3,661.03/65.20
  6. Step 6: Final answer
    x = 56.15

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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.