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Finding the Fourth Proportional to 12,959.40, 19,439.10 and 12,230.40

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Solution

The fourth proportional to 12,959.40, 19,439.10 and 12,230.40 is: 18,345.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,959.40 : 19,439.10 = 12,230.40 : x
  2. Step 2: Convert to fraction form
    12,959.40/19,439.10 = 12,230.40/x
  3. Step 3: Cross multiply
    12,959.40x = 19,439.10 × 12,230.40
  4. Step 4: Simplify right side
    12,959.40x = 237,747,968.64
  5. Step 5: Solve for x
    x = 237,747,968.64/12,959.40
  6. Step 6: Final answer
    x = 18,345.60

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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.