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Finding the Fourth Proportional to 75.42, 103.99 and 65.49

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Solution

The fourth proportional to 75.42, 103.99 and 65.49 is: 90.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.42 : 103.99 = 65.49 : x
  2. Step 2: Convert to fraction form
    75.42/103.99 = 65.49/x
  3. Step 3: Cross multiply
    75.42x = 103.99 × 65.49
  4. Step 4: Simplify right side
    75.42x = 6,811.10
  5. Step 5: Solve for x
    x = 6,811.10/75.42
  6. Step 6: Final answer
    x = 90.31

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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.