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Finding the Fourth Proportional to 15.87, 23.61 and 15.45

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Solution

The fourth proportional to 15.87, 23.61 and 15.45 is: 22.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.87 : 23.61 = 15.45 : x
  2. Step 2: Convert to fraction form
    15.87/23.61 = 15.45/x
  3. Step 3: Cross multiply
    15.87x = 23.61 × 15.45
  4. Step 4: Simplify right side
    15.87x = 364.77
  5. Step 5: Solve for x
    x = 364.77/15.87
  6. Step 6: Final answer
    x = 22.99

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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.