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Finding the Fourth Proportional to 55.48, 83.21 and 19.40

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Solution

The fourth proportional to 55.48, 83.21 and 19.40 is: 29.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.48 : 83.21 = 19.40 : x
  2. Step 2: Convert to fraction form
    55.48/83.21 = 19.40/x
  3. Step 3: Cross multiply
    55.48x = 83.21 × 19.40
  4. Step 4: Simplify right side
    55.48x = 1,614.01
  5. Step 5: Solve for x
    x = 1,614.01/55.48
  6. Step 6: Final answer
    x = 29.09

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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.