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Finding the Fourth Proportional to 5.22, 7.80 and 4.72

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Solution

The fourth proportional to 5.22, 7.80 and 4.72 is: 7.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.22 : 7.80 = 4.72 : x
  2. Step 2: Convert to fraction form
    5.22/7.80 = 4.72/x
  3. Step 3: Cross multiply
    5.22x = 7.80 × 4.72
  4. Step 4: Simplify right side
    5.22x = 36.78
  5. Step 5: Solve for x
    x = 36.78/5.22
  6. Step 6: Final answer
    x = 7.05

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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.