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Finding the Fourth Proportional to 50.39, 75.30 and 40.64

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Solution

The fourth proportional to 50.39, 75.30 and 40.64 is: 60.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.39 : 75.30 = 40.64 : x
  2. Step 2: Convert to fraction form
    50.39/75.30 = 40.64/x
  3. Step 3: Cross multiply
    50.39x = 75.30 × 40.64
  4. Step 4: Simplify right side
    50.39x = 3,059.66
  5. Step 5: Solve for x
    x = 3,059.66/50.39
  6. Step 6: Final answer
    x = 60.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.