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Finding the Fourth Proportional to 12,891.76, 19,191.08 and 12,287.90

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Solution

The fourth proportional to 12,891.76, 19,191.08 and 12,287.90 is: 18,292.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.76 : 19,191.08 = 12,287.90 : x
  2. Step 2: Convert to fraction form
    12,891.76/19,191.08 = 12,287.90/x
  3. Step 3: Cross multiply
    12,891.76x = 19,191.08 × 12,287.90
  4. Step 4: Simplify right side
    12,891.76x = 235,818,081.51
  5. Step 5: Solve for x
    x = 235,818,081.51/12,891.76
  6. Step 6: Final answer
    x = 18,292.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.