Home / 21,869.39-30,176.74-12,309.77

Finding the Fourth Proportional to 21,869.39, 30,176.74 and 12,309.77

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Solution

The fourth proportional to 21,869.39, 30,176.74 and 12,309.77 is: 16,985.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.39 : 30,176.74 = 12,309.77 : x
  2. Step 2: Convert to fraction form
    21,869.39/30,176.74 = 12,309.77/x
  3. Step 3: Cross multiply
    21,869.39x = 30,176.74 × 12,309.77
  4. Step 4: Simplify right side
    21,869.39x = 371,468,728.75
  5. Step 5: Solve for x
    x = 371,468,728.75/21,869.39
  6. Step 6: Final answer
    x = 16,985.78

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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.