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Finding the Fourth Proportional to 8,679.20, 13,028.40 and 4,791.20

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Solution

The fourth proportional to 8,679.20, 13,028.40 and 4,791.20 is: 7,192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.20 : 13,028.40 = 4,791.20 : x
  2. Step 2: Convert to fraction form
    8,679.20/13,028.40 = 4,791.20/x
  3. Step 3: Cross multiply
    8,679.20x = 13,028.40 × 4,791.20
  4. Step 4: Simplify right side
    8,679.20x = 62,421,670.08
  5. Step 5: Solve for x
    x = 62,421,670.08/8,679.20
  6. Step 6: Final answer
    x = 7,192.10

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1.5x scale

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.