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Finding the Fourth Proportional to 5.61, 8.40 and 4.75

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Solution

The fourth proportional to 5.61, 8.40 and 4.75 is: 7.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.61 : 8.40 = 4.75 : x
  2. Step 2: Convert to fraction form
    5.61/8.40 = 4.75/x
  3. Step 3: Cross multiply
    5.61x = 8.40 × 4.75
  4. Step 4: Simplify right side
    5.61x = 39.90
  5. Step 5: Solve for x
    x = 39.90/5.61
  6. Step 6: Final answer
    x = 7.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.