Home / 21,239.79-29,311.01-11,680.29

Finding the Fourth Proportional to 21,239.79, 29,311.01 and 11,680.29

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Solution

The fourth proportional to 21,239.79, 29,311.01 and 11,680.29 is: 16,118.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.79 : 29,311.01 = 11,680.29 : x
  2. Step 2: Convert to fraction form
    21,239.79/29,311.01 = 11,680.29/x
  3. Step 3: Cross multiply
    21,239.79x = 29,311.01 × 11,680.29
  4. Step 4: Simplify right side
    21,239.79x = 342,361,038.59
  5. Step 5: Solve for x
    x = 342,361,038.59/21,239.79
  6. Step 6: Final answer
    x = 16,118.85

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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.