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Finding the Fourth Proportional to 53.39, 79.90 and 39.83

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Solution

The fourth proportional to 53.39, 79.90 and 39.83 is: 59.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.39 : 79.90 = 39.83 : x
  2. Step 2: Convert to fraction form
    53.39/79.90 = 39.83/x
  3. Step 3: Cross multiply
    53.39x = 79.90 × 39.83
  4. Step 4: Simplify right side
    53.39x = 3,182.42
  5. Step 5: Solve for x
    x = 3,182.42/53.39
  6. Step 6: Final answer
    x = 59.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.