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Finding the Fourth Proportional to 12,671.40, 18,982.80 and 7,726.35

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Solution

The fourth proportional to 12,671.40, 18,982.80 and 7,726.35 is: 11,574.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,671.40 : 18,982.80 = 7,726.35 : x
  2. Step 2: Convert to fraction form
    12,671.40/18,982.80 = 7,726.35/x
  3. Step 3: Cross multiply
    12,671.40x = 18,982.80 × 7,726.35
  4. Step 4: Simplify right side
    12,671.40x = 146,667,756.78
  5. Step 5: Solve for x
    x = 146,667,756.78/12,671.40
  6. Step 6: Final answer
    x = 11,574.71

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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.