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Finding the Fourth Proportional to 5.17, 7.76 and 2.50

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Solution

The fourth proportional to 5.17, 7.76 and 2.50 is: 3.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.17 : 7.76 = 2.50 : x
  2. Step 2: Convert to fraction form
    5.17/7.76 = 2.50/x
  3. Step 3: Cross multiply
    5.17x = 7.76 × 2.50
  4. Step 4: Simplify right side
    5.17x = 19.40
  5. Step 5: Solve for x
    x = 19.40/5.17
  6. Step 6: Final answer
    x = 3.75

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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.