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Finding the Fourth Proportional to 18.61, 25.60 and 15.99

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Solution

The fourth proportional to 18.61, 25.60 and 15.99 is: 22.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.61 : 25.60 = 15.99 : x
  2. Step 2: Convert to fraction form
    18.61/25.60 = 15.99/x
  3. Step 3: Cross multiply
    18.61x = 25.60 × 15.99
  4. Step 4: Simplify right side
    18.61x = 409.34
  5. Step 5: Solve for x
    x = 409.34/18.61
  6. Step 6: Final answer
    x = 22.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.