Home / 21,103.20-29,127.60-12,722.40

Finding the Fourth Proportional to 21,103.20, 29,127.60 and 12,722.40

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Solution

The fourth proportional to 21,103.20, 29,127.60 and 12,722.40 is: 17,560.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,103.20 : 29,127.60 = 12,722.40 : x
  2. Step 2: Convert to fraction form
    21,103.20/29,127.60 = 12,722.40/x
  3. Step 3: Cross multiply
    21,103.20x = 29,127.60 × 12,722.40
  4. Step 4: Simplify right side
    21,103.20x = 370,572,978.24
  5. Step 5: Solve for x
    x = 370,572,978.24/21,103.20
  6. Step 6: Final answer
    x = 17,560.04

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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.