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Finding the Fourth Proportional to 15.73, 21.70 and 10.87

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Solution

The fourth proportional to 15.73, 21.70 and 10.87 is: 15.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.73 : 21.70 = 10.87 : x
  2. Step 2: Convert to fraction form
    15.73/21.70 = 10.87/x
  3. Step 3: Cross multiply
    15.73x = 21.70 × 10.87
  4. Step 4: Simplify right side
    15.73x = 235.88
  5. Step 5: Solve for x
    x = 235.88/15.73
  6. Step 6: Final answer
    x = 15.00

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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.