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Finding the Fourth Proportional to 10.50, 15.65 and 9.81

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Solution

The fourth proportional to 10.50, 15.65 and 9.81 is: 14.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.50 : 15.65 = 9.81 : x
  2. Step 2: Convert to fraction form
    10.50/15.65 = 9.81/x
  3. Step 3: Cross multiply
    10.50x = 15.65 × 9.81
  4. Step 4: Simplify right side
    10.50x = 153.48
  5. Step 5: Solve for x
    x = 153.48/10.50
  6. Step 6: Final answer
    x = 14.62

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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.