Home / 21,209.10-31,813.65-20,115.60

Finding the Fourth Proportional to 21,209.10, 31,813.65 and 20,115.60

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Solution

The fourth proportional to 21,209.10, 31,813.65 and 20,115.60 is: 30,173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,209.10 : 31,813.65 = 20,115.60 : x
  2. Step 2: Convert to fraction form
    21,209.10/31,813.65 = 20,115.60/x
  3. Step 3: Cross multiply
    21,209.10x = 31,813.65 × 20,115.60
  4. Step 4: Simplify right side
    21,209.10x = 639,950,657.94
  5. Step 5: Solve for x
    x = 639,950,657.94/21,209.10
  6. Step 6: Final answer
    x = 30,173.40

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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.