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Finding the Fourth Proportional to 5.63, 8.40 and 5.57

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Solution

The fourth proportional to 5.63, 8.40 and 5.57 is: 8.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.63 : 8.40 = 5.57 : x
  2. Step 2: Convert to fraction form
    5.63/8.40 = 5.57/x
  3. Step 3: Cross multiply
    5.63x = 8.40 × 5.57
  4. Step 4: Simplify right side
    5.63x = 46.75
  5. Step 5: Solve for x
    x = 46.75/5.63
  6. Step 6: Final answer
    x = 8.31

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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.