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Finding the Fourth Proportional to 7, 10.45 and 5.50

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Solution

The fourth proportional to 7, 10.45 and 5.50 is: 8.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7 : 10.45 = 5.50 : x
  2. Step 2: Convert to fraction form
    7/10.45 = 5.50/x
  3. Step 3: Cross multiply
    7x = 10.45 × 5.50
  4. Step 4: Simplify right side
    7x = 57.48
  5. Step 5: Solve for x
    x = 57.48/7
  6. Step 6: Final answer
    x = 8.21

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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.