Home / 21,855.11-30,160.80-13,897.16

Finding the Fourth Proportional to 21,855.11, 30,160.80 and 13,897.16

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Solution

The fourth proportional to 21,855.11, 30,160.80 and 13,897.16 is: 19,178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,855.11 : 30,160.80 = 13,897.16 : x
  2. Step 2: Convert to fraction form
    21,855.11/30,160.80 = 13,897.16/x
  3. Step 3: Cross multiply
    21,855.11x = 30,160.80 × 13,897.16
  4. Step 4: Simplify right side
    21,855.11x = 419,149,312.52
  5. Step 5: Solve for x
    x = 419,149,312.52/21,855.11
  6. Step 6: Final answer
    x = 19,178.55

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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.