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Finding the Fourth Proportional to 15.90, 21.94 and 9.76

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Solution

The fourth proportional to 15.90, 21.94 and 9.76 is: 13.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.90 : 21.94 = 9.76 : x
  2. Step 2: Convert to fraction form
    15.90/21.94 = 9.76/x
  3. Step 3: Cross multiply
    15.90x = 21.94 × 9.76
  4. Step 4: Simplify right side
    15.90x = 214.21
  5. Step 5: Solve for x
    x = 214.21/15.90
  6. Step 6: Final answer
    x = 13.47

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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.