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Finding the Fourth Proportional to 12,930.20, 19,424.10 and 12,405.40

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Solution

The fourth proportional to 12,930.20, 19,424.10 and 12,405.40 is: 18,635.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,930.20 : 19,424.10 = 12,405.40 : x
  2. Step 2: Convert to fraction form
    12,930.20/19,424.10 = 12,405.40/x
  3. Step 3: Cross multiply
    12,930.20x = 19,424.10 × 12,405.40
  4. Step 4: Simplify right side
    12,930.20x = 240,963,730.14
  5. Step 5: Solve for x
    x = 240,963,730.14/12,930.20
  6. Step 6: Final answer
    x = 18,635.73

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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.