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Finding the Fourth Proportional to 50.85, 70.12 and 39.93

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Solution

The fourth proportional to 50.85, 70.12 and 39.93 is: 55.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.85 : 70.12 = 39.93 : x
  2. Step 2: Convert to fraction form
    50.85/70.12 = 39.93/x
  3. Step 3: Cross multiply
    50.85x = 70.12 × 39.93
  4. Step 4: Simplify right side
    50.85x = 2,799.89
  5. Step 5: Solve for x
    x = 2,799.89/50.85
  6. Step 6: Final answer
    x = 55.06

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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.