Home / 21,920.61-30,243.18-12,359.30

Finding the Fourth Proportional to 21,920.61, 30,243.18 and 12,359.30

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Solution

The fourth proportional to 21,920.61, 30,243.18 and 12,359.30 is: 17,051.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.61 : 30,243.18 = 12,359.30 : x
  2. Step 2: Convert to fraction form
    21,920.61/30,243.18 = 12,359.30/x
  3. Step 3: Cross multiply
    21,920.61x = 30,243.18 × 12,359.30
  4. Step 4: Simplify right side
    21,920.61x = 373,784,383.36
  5. Step 5: Solve for x
    x = 373,784,383.36/21,920.61
  6. Step 6: Final answer
    x = 17,051.73

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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.