Home / 21,857.31-30,165.08-12,425.85

Finding the Fourth Proportional to 21,857.31, 30,165.08 and 12,425.85

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Solution

The fourth proportional to 21,857.31, 30,165.08 and 12,425.85 is: 17,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,857.31 : 30,165.08 = 12,425.85 : x
  2. Step 2: Convert to fraction form
    21,857.31/30,165.08 = 12,425.85/x
  3. Step 3: Cross multiply
    21,857.31x = 30,165.08 × 12,425.85
  4. Step 4: Simplify right side
    21,857.31x = 374,826,697.19
  5. Step 5: Solve for x
    x = 374,826,697.19/21,857.31
  6. Step 6: Final answer
    x = 17,148.80

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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.