Home / 21,963.78-30,308.45-12,400.72

Finding the Fourth Proportional to 21,963.78, 30,308.45 and 12,400.72

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Solution

The fourth proportional to 21,963.78, 30,308.45 and 12,400.72 is: 17,112.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,963.78 : 30,308.45 = 12,400.72 : x
  2. Step 2: Convert to fraction form
    21,963.78/30,308.45 = 12,400.72/x
  3. Step 3: Cross multiply
    21,963.78x = 30,308.45 × 12,400.72
  4. Step 4: Simplify right side
    21,963.78x = 375,846,464.31
  5. Step 5: Solve for x
    x = 375,846,464.31/21,963.78
  6. Step 6: Final answer
    x = 17,112.10

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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.