Home / 21,007.20-31,535.10-12,129.60

Finding the Fourth Proportional to 21,007.20, 31,535.10 and 12,129.60

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Solution

The fourth proportional to 21,007.20, 31,535.10 and 12,129.60 is: 18,208.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.20 : 31,535.10 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    21,007.20/31,535.10 = 12,129.60/x
  3. Step 3: Cross multiply
    21,007.20x = 31,535.10 × 12,129.60
  4. Step 4: Simplify right side
    21,007.20x = 382,508,148.96
  5. Step 5: Solve for x
    x = 382,508,148.96/21,007.20
  6. Step 6: Final answer
    x = 18,208.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.