Home / 21,117.08-29,144.64-13,161.80

Finding the Fourth Proportional to 21,117.08, 29,144.64 and 13,161.80

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Solution

The fourth proportional to 21,117.08, 29,144.64 and 13,161.80 is: 18,165.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.08 : 29,144.64 = 13,161.80 : x
  2. Step 2: Convert to fraction form
    21,117.08/29,144.64 = 13,161.80/x
  3. Step 3: Cross multiply
    21,117.08x = 29,144.64 × 13,161.80
  4. Step 4: Simplify right side
    21,117.08x = 383,595,922.75
  5. Step 5: Solve for x
    x = 383,595,922.75/21,117.08
  6. Step 6: Final answer
    x = 18,165.20

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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.