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Finding the Fourth Proportional to 12,943.60, 19,415.40 and 12,230.80

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Solution

The fourth proportional to 12,943.60, 19,415.40 and 12,230.80 is: 18,346.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,943.60 : 19,415.40 = 12,230.80 : x
  2. Step 2: Convert to fraction form
    12,943.60/19,415.40 = 12,230.80/x
  3. Step 3: Cross multiply
    12,943.60x = 19,415.40 × 12,230.80
  4. Step 4: Simplify right side
    12,943.60x = 237,465,874.32
  5. Step 5: Solve for x
    x = 237,465,874.32/12,943.60
  6. Step 6: Final answer
    x = 18,346.20

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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.