Home / 21,899.04-30,209.85-12,942.21

Finding the Fourth Proportional to 21,899.04, 30,209.85 and 12,942.21

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Solution

The fourth proportional to 21,899.04, 30,209.85 and 12,942.21 is: 17,853.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.04 : 30,209.85 = 12,942.21 : x
  2. Step 2: Convert to fraction form
    21,899.04/30,209.85 = 12,942.21/x
  3. Step 3: Cross multiply
    21,899.04x = 30,209.85 × 12,942.21
  4. Step 4: Simplify right side
    21,899.04x = 390,982,222.77
  5. Step 5: Solve for x
    x = 390,982,222.77/21,899.04
  6. Step 6: Final answer
    x = 17,853.85

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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.