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Finding the Fourth Proportional to 53.21, 79.80 and 30.38

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Solution

The fourth proportional to 53.21, 79.80 and 30.38 is: 45.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.21 : 79.80 = 30.38 : x
  2. Step 2: Convert to fraction form
    53.21/79.80 = 30.38/x
  3. Step 3: Cross multiply
    53.21x = 79.80 × 30.38
  4. Step 4: Simplify right side
    53.21x = 2,423.93
  5. Step 5: Solve for x
    x = 2,423.93/53.21
  6. Step 6: Final answer
    x = 45.56

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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.