Home / 21,821.86-30,115.16-12,869.74

Finding the Fourth Proportional to 21,821.86, 30,115.16 and 12,869.74

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Solution

The fourth proportional to 21,821.86, 30,115.16 and 12,869.74 is: 17,760.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.86 : 30,115.16 = 12,869.74 : x
  2. Step 2: Convert to fraction form
    21,821.86/30,115.16 = 12,869.74/x
  3. Step 3: Cross multiply
    21,821.86x = 30,115.16 × 12,869.74
  4. Step 4: Simplify right side
    21,821.86x = 387,574,279.26
  5. Step 5: Solve for x
    x = 387,574,279.26/21,821.86
  6. Step 6: Final answer
    x = 17,760.83

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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.