Home / 21,320.20-31,980.30-16,865.80

Finding the Fourth Proportional to 21,320.20, 31,980.30 and 16,865.80

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Solution

The fourth proportional to 21,320.20, 31,980.30 and 16,865.80 is: 25,298.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.20 : 31,980.30 = 16,865.80 : x
  2. Step 2: Convert to fraction form
    21,320.20/31,980.30 = 16,865.80/x
  3. Step 3: Cross multiply
    21,320.20x = 31,980.30 × 16,865.80
  4. Step 4: Simplify right side
    21,320.20x = 539,373,343.74
  5. Step 5: Solve for x
    x = 539,373,343.74/21,320.20
  6. Step 6: Final answer
    x = 25,298.70

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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.