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Finding the Fourth Proportional to 53.18, 79.80 and 39.64

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Solution

The fourth proportional to 53.18, 79.80 and 39.64 is: 59.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.18 : 79.80 = 39.64 : x
  2. Step 2: Convert to fraction form
    53.18/79.80 = 39.64/x
  3. Step 3: Cross multiply
    53.18x = 79.80 × 39.64
  4. Step 4: Simplify right side
    53.18x = 3,163.27
  5. Step 5: Solve for x
    x = 3,163.27/53.18
  6. Step 6: Final answer
    x = 59.48

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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.