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Finding the Fourth Proportional to 5.68, 7.80 and 5.61

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Solution

The fourth proportional to 5.68, 7.80 and 5.61 is: 7.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.68 : 7.80 = 5.61 : x
  2. Step 2: Convert to fraction form
    5.68/7.80 = 5.61/x
  3. Step 3: Cross multiply
    5.68x = 7.80 × 5.61
  4. Step 4: Simplify right side
    5.68x = 43.76
  5. Step 5: Solve for x
    x = 43.76/5.68
  6. Step 6: Final answer
    x = 7.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.