Home / 21,979.51-30,331.09-12,904.72

Finding the Fourth Proportional to 21,979.51, 30,331.09 and 12,904.72

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Solution

The fourth proportional to 21,979.51, 30,331.09 and 12,904.72 is: 17,808.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.51 : 30,331.09 = 12,904.72 : x
  2. Step 2: Convert to fraction form
    21,979.51/30,331.09 = 12,904.72/x
  3. Step 3: Cross multiply
    21,979.51x = 30,331.09 × 12,904.72
  4. Step 4: Simplify right side
    21,979.51x = 391,414,223.74
  5. Step 5: Solve for x
    x = 391,414,223.74/21,979.51
  6. Step 6: Final answer
    x = 17,808.14

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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.