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Finding the Fourth Proportional to 5.31, 7.91 and 5.07

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Solution

The fourth proportional to 5.31, 7.91 and 5.07 is: 7.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.31 : 7.91 = 5.07 : x
  2. Step 2: Convert to fraction form
    5.31/7.91 = 5.07/x
  3. Step 3: Cross multiply
    5.31x = 7.91 × 5.07
  4. Step 4: Simplify right side
    5.31x = 40.06
  5. Step 5: Solve for x
    x = 40.06/5.31
  6. Step 6: Final answer
    x = 7.55

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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.