Home / 20,999.20-31,498.80-20,853.40

Finding the Fourth Proportional to 20,999.20, 31,498.80 and 20,853.40

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Solution

The fourth proportional to 20,999.20, 31,498.80 and 20,853.40 is: 31,280.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.20 : 31,498.80 = 20,853.40 : x
  2. Step 2: Convert to fraction form
    20,999.20/31,498.80 = 20,853.40/x
  3. Step 3: Cross multiply
    20,999.20x = 31,498.80 × 20,853.40
  4. Step 4: Simplify right side
    20,999.20x = 656,857,075.92
  5. Step 5: Solve for x
    x = 656,857,075.92/20,999.20
  6. Step 6: Final answer
    x = 31,280.10

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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.