Home / 20,918.32-28,889.94-12,979.48

Finding the Fourth Proportional to 20,918.32, 28,889.94 and 12,979.48

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Solution

The fourth proportional to 20,918.32, 28,889.94 and 12,979.48 is: 17,925.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.32 : 28,889.94 = 12,979.48 : x
  2. Step 2: Convert to fraction form
    20,918.32/28,889.94 = 12,979.48/x
  3. Step 3: Cross multiply
    20,918.32x = 28,889.94 × 12,979.48
  4. Step 4: Simplify right side
    20,918.32x = 374,976,398.43
  5. Step 5: Solve for x
    x = 374,976,398.43/20,918.32
  6. Step 6: Final answer
    x = 17,925.74

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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.