Home / 21,117.91-29,142.98-11,687.35

Finding the Fourth Proportional to 21,117.91, 29,142.98 and 11,687.35

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Solution

The fourth proportional to 21,117.91, 29,142.98 and 11,687.35 is: 16,128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,117.91 : 29,142.98 = 11,687.35 : x
  2. Step 2: Convert to fraction form
    21,117.91/29,142.98 = 11,687.35/x
  3. Step 3: Cross multiply
    21,117.91x = 29,142.98 × 11,687.35
  4. Step 4: Simplify right side
    21,117.91x = 340,604,207.30
  5. Step 5: Solve for x
    x = 340,604,207.30/21,117.91
  6. Step 6: Final answer
    x = 16,128.69

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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.