Home / 21,079.92-29,090.71-11,520.40

Finding the Fourth Proportional to 21,079.92, 29,090.71 and 11,520.40

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Solution

The fourth proportional to 21,079.92, 29,090.71 and 11,520.40 is: 15,898.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.92 : 29,090.71 = 11,520.40 : x
  2. Step 2: Convert to fraction form
    21,079.92/29,090.71 = 11,520.40/x
  3. Step 3: Cross multiply
    21,079.92x = 29,090.71 × 11,520.40
  4. Step 4: Simplify right side
    21,079.92x = 335,136,655.45
  5. Step 5: Solve for x
    x = 335,136,655.45/21,079.92
  6. Step 6: Final answer
    x = 15,898.38

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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.