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Finding the Fourth Proportional to 7, 10.50 and 2.72

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Solution

The fourth proportional to 7, 10.50 and 2.72 is: 4.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7 : 10.50 = 2.72 : x
  2. Step 2: Convert to fraction form
    7/10.50 = 2.72/x
  3. Step 3: Cross multiply
    7x = 10.50 × 2.72
  4. Step 4: Simplify right side
    7x = 28.55
  5. Step 5: Solve for x
    x = 28.55/7
  6. Step 6: Final answer
    x = 4.08

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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.