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Finding the Fourth Proportional to 12,979.40, 19,425.90 and 11,424.20

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Solution

The fourth proportional to 12,979.40, 19,425.90 and 11,424.20 is: 17,098.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.40 : 19,425.90 = 11,424.20 : x
  2. Step 2: Convert to fraction form
    12,979.40/19,425.90 = 11,424.20/x
  3. Step 3: Cross multiply
    12,979.40x = 19,425.90 × 11,424.20
  4. Step 4: Simplify right side
    12,979.40x = 221,925,366.78
  5. Step 5: Solve for x
    x = 221,925,366.78/12,979.40
  6. Step 6: Final answer
    x = 17,098.28

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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.