Home / 21,246.80-31,805.40-12,455.60

Finding the Fourth Proportional to 21,246.80, 31,805.40 and 12,455.60

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Solution

The fourth proportional to 21,246.80, 31,805.40 and 12,455.60 is: 18,645.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,246.80 : 31,805.40 = 12,455.60 : x
  2. Step 2: Convert to fraction form
    21,246.80/31,805.40 = 12,455.60/x
  3. Step 3: Cross multiply
    21,246.80x = 31,805.40 × 12,455.60
  4. Step 4: Simplify right side
    21,246.80x = 396,155,340.24
  5. Step 5: Solve for x
    x = 396,155,340.24/21,246.80
  6. Step 6: Final answer
    x = 18,645.41

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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.