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Finding the Fourth Proportional to 6.25, 8.60 and 5.57

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Solution

The fourth proportional to 6.25, 8.60 and 5.57 is: 7.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.25 : 8.60 = 5.57 : x
  2. Step 2: Convert to fraction form
    6.25/8.60 = 5.57/x
  3. Step 3: Cross multiply
    6.25x = 8.60 × 5.57
  4. Step 4: Simplify right side
    6.25x = 47.89
  5. Step 5: Solve for x
    x = 47.89/6.25
  6. Step 6: Final answer
    x = 7.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.