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Finding the Fourth Proportional to 55.72, 83.58 and 19.65

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Solution

The fourth proportional to 55.72, 83.58 and 19.65 is: 29.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.72 : 83.58 = 19.65 : x
  2. Step 2: Convert to fraction form
    55.72/83.58 = 19.65/x
  3. Step 3: Cross multiply
    55.72x = 83.58 × 19.65
  4. Step 4: Simplify right side
    55.72x = 1,642.70
  5. Step 5: Solve for x
    x = 1,642.70/55.72
  6. Step 6: Final answer
    x = 29.48

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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.