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Finding the Fourth Proportional to 12,861.60, 19,292.40 and 7,015.20

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Solution

The fourth proportional to 12,861.60, 19,292.40 and 7,015.20 is: 10,522.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,861.60 : 19,292.40 = 7,015.20 : x
  2. Step 2: Convert to fraction form
    12,861.60/19,292.40 = 7,015.20/x
  3. Step 3: Cross multiply
    12,861.60x = 19,292.40 × 7,015.20
  4. Step 4: Simplify right side
    12,861.60x = 135,340,044.48
  5. Step 5: Solve for x
    x = 135,340,044.48/12,861.60
  6. Step 6: Final answer
    x = 10,522.80

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Similar ratio
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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.