Home / 21,979.05-30,330.45-12,904.26

Finding the Fourth Proportional to 21,979.05, 30,330.45 and 12,904.26

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Solution

The fourth proportional to 21,979.05, 30,330.45 and 12,904.26 is: 17,807.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.05 : 30,330.45 = 12,904.26 : x
  2. Step 2: Convert to fraction form
    21,979.05/30,330.45 = 12,904.26/x
  3. Step 3: Cross multiply
    21,979.05x = 30,330.45 × 12,904.26
  4. Step 4: Simplify right side
    21,979.05x = 391,392,012.72
  5. Step 5: Solve for x
    x = 391,392,012.72/21,979.05
  6. Step 6: Final answer
    x = 17,807.50

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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.