Home / 21,869.82-30,180.47-12,309.89

Finding the Fourth Proportional to 21,869.82, 30,180.47 and 12,309.89

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Solution

The fourth proportional to 21,869.82, 30,180.47 and 12,309.89 is: 16,987.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.82 : 30,180.47 = 12,309.89 : x
  2. Step 2: Convert to fraction form
    21,869.82/30,180.47 = 12,309.89/x
  3. Step 3: Cross multiply
    21,869.82x = 30,180.47 × 12,309.89
  4. Step 4: Simplify right side
    21,869.82x = 371,518,265.85
  5. Step 5: Solve for x
    x = 371,518,265.85/21,869.82
  6. Step 6: Final answer
    x = 16,987.72

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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.