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Finding the Fourth Proportional to 10.50, 15.74 and 4.40

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Solution

The fourth proportional to 10.50, 15.74 and 4.40 is: 6.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.50 : 15.74 = 4.40 : x
  2. Step 2: Convert to fraction form
    10.50/15.74 = 4.40/x
  3. Step 3: Cross multiply
    10.50x = 15.74 × 4.40
  4. Step 4: Simplify right side
    10.50x = 69.27
  5. Step 5: Solve for x
    x = 69.27/10.50
  6. Step 6: Final answer
    x = 6.60

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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.