Home / 21,270.40-31,900.20-8,780.20

Finding the Fourth Proportional to 21,270.40, 31,900.20 and 8,780.20

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Solution

The fourth proportional to 21,270.40, 31,900.20 and 8,780.20 is: 13,168.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.40 : 31,900.20 = 8,780.20 : x
  2. Step 2: Convert to fraction form
    21,270.40/31,900.20 = 8,780.20/x
  3. Step 3: Cross multiply
    21,270.40x = 31,900.20 × 8,780.20
  4. Step 4: Simplify right side
    21,270.40x = 280,090,136.04
  5. Step 5: Solve for x
    x = 280,090,136.04/21,270.40
  6. Step 6: Final answer
    x = 13,168.07

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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.