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Finding the Fourth Proportional to 10.53, 15.78 and 9.21

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Solution

The fourth proportional to 10.53, 15.78 and 9.21 is: 13.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.53 : 15.78 = 9.21 : x
  2. Step 2: Convert to fraction form
    10.53/15.78 = 9.21/x
  3. Step 3: Cross multiply
    10.53x = 15.78 × 9.21
  4. Step 4: Simplify right side
    10.53x = 145.33
  5. Step 5: Solve for x
    x = 145.33/10.53
  6. Step 6: Final answer
    x = 13.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.