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Finding the Fourth Proportional to 15.69, 23.42 and 13.77

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Solution

The fourth proportional to 15.69, 23.42 and 13.77 is: 20.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.69 : 23.42 = 13.77 : x
  2. Step 2: Convert to fraction form
    15.69/23.42 = 13.77/x
  3. Step 3: Cross multiply
    15.69x = 23.42 × 13.77
  4. Step 4: Simplify right side
    15.69x = 322.42
  5. Step 5: Solve for x
    x = 322.42/15.69
  6. Step 6: Final answer
    x = 20.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.