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Finding the Fourth Proportional to 9,890, 13,648.20 and 5,474

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Solution

The fourth proportional to 9,890, 13,648.20 and 5,474 is: 7,554.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,890 : 13,648.20 = 5,474 : x
  2. Step 2: Convert to fraction form
    9,890/13,648.20 = 5,474/x
  3. Step 3: Cross multiply
    9,890x = 13,648.20 × 5,474
  4. Step 4: Simplify right side
    9,890x = 74,710,246.80
  5. Step 5: Solve for x
    x = 74,710,246.80/9,890
  6. Step 6: Final answer
    x = 7,554.12

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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.