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Finding the Fourth Proportional to 50.90, 70.20 and 39.83

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Solution

The fourth proportional to 50.90, 70.20 and 39.83 is: 54.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.90 : 70.20 = 39.83 : x
  2. Step 2: Convert to fraction form
    50.90/70.20 = 39.83/x
  3. Step 3: Cross multiply
    50.90x = 70.20 × 39.83
  4. Step 4: Simplify right side
    50.90x = 2,795.72
  5. Step 5: Solve for x
    x = 2,795.72/50.90
  6. Step 6: Final answer
    x = 54.93

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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.