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Finding the Fourth Proportional to 9,129.80, 13,690.70 and 4,197.80

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Solution

The fourth proportional to 9,129.80, 13,690.70 and 4,197.80 is: 6,294.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,129.80 : 13,690.70 = 4,197.80 : x
  2. Step 2: Convert to fraction form
    9,129.80/13,690.70 = 4,197.80/x
  3. Step 3: Cross multiply
    9,129.80x = 13,690.70 × 4,197.80
  4. Step 4: Simplify right side
    9,129.80x = 57,470,820.46
  5. Step 5: Solve for x
    x = 57,470,820.46/9,129.80
  6. Step 6: Final answer
    x = 6,294.86

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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.