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Finding the Fourth Proportional to 12,891.20, 19,341.39 and 7,955.09

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Solution

The fourth proportional to 12,891.20, 19,341.39 and 7,955.09 is: 11,935.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.20 : 19,341.39 = 7,955.09 : x
  2. Step 2: Convert to fraction form
    12,891.20/19,341.39 = 7,955.09/x
  3. Step 3: Cross multiply
    12,891.20x = 19,341.39 × 7,955.09
  4. Step 4: Simplify right side
    12,891.20x = 153,862,401.47
  5. Step 5: Solve for x
    x = 153,862,401.47/12,891.20
  6. Step 6: Final answer
    x = 11,935.46

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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.