Home / 21,305.35-29,392.11-12,686.71

Finding the Fourth Proportional to 21,305.35, 29,392.11 and 12,686.71

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Solution

The fourth proportional to 21,305.35, 29,392.11 and 12,686.71 is: 17,502.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,305.35 : 29,392.11 = 12,686.71 : x
  2. Step 2: Convert to fraction form
    21,305.35/29,392.11 = 12,686.71/x
  3. Step 3: Cross multiply
    21,305.35x = 29,392.11 × 12,686.71
  4. Step 4: Simplify right side
    21,305.35x = 372,889,175.86
  5. Step 5: Solve for x
    x = 372,889,175.86/21,305.35
  6. Step 6: Final answer
    x = 17,502.14

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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.