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Finding the Fourth Proportional to 18,995.80, 26,231.70 and 12,726.40

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Solution

The fourth proportional to 18,995.80, 26,231.70 and 12,726.40 is: 17,574.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.80 : 26,231.70 = 12,726.40 : x
  2. Step 2: Convert to fraction form
    18,995.80/26,231.70 = 12,726.40/x
  3. Step 3: Cross multiply
    18,995.80x = 26,231.70 × 12,726.40
  4. Step 4: Simplify right side
    18,995.80x = 333,835,106.88
  5. Step 5: Solve for x
    x = 333,835,106.88/18,995.80
  6. Step 6: Final answer
    x = 17,574.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.