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Finding the Fourth Proportional to 6.90, 10.31 and 5.77

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Solution

The fourth proportional to 6.90, 10.31 and 5.77 is: 8.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.90 : 10.31 = 5.77 : x
  2. Step 2: Convert to fraction form
    6.90/10.31 = 5.77/x
  3. Step 3: Cross multiply
    6.90x = 10.31 × 5.77
  4. Step 4: Simplify right side
    6.90x = 59.49
  5. Step 5: Solve for x
    x = 59.49/6.90
  6. Step 6: Final answer
    x = 8.62

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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.