Home / 21,845.52-30,145.80-12,893.40

Finding the Fourth Proportional to 21,845.52, 30,145.80 and 12,893.40

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Solution

The fourth proportional to 21,845.52, 30,145.80 and 12,893.40 is: 17,792.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,845.52 : 30,145.80 = 12,893.40 : x
  2. Step 2: Convert to fraction form
    21,845.52/30,145.80 = 12,893.40/x
  3. Step 3: Cross multiply
    21,845.52x = 30,145.80 × 12,893.40
  4. Step 4: Simplify right side
    21,845.52x = 388,681,857.72
  5. Step 5: Solve for x
    x = 388,681,857.72/21,845.52
  6. Step 6: Final answer
    x = 17,792.29

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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.