Home / 21,780.28-32,670.42-6,990.22

Finding the Fourth Proportional to 21,780.28, 32,670.42 and 6,990.22

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Solution

The fourth proportional to 21,780.28, 32,670.42 and 6,990.22 is: 10,485.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,780.28 : 32,670.42 = 6,990.22 : x
  2. Step 2: Convert to fraction form
    21,780.28/32,670.42 = 6,990.22/x
  3. Step 3: Cross multiply
    21,780.28x = 32,670.42 × 6,990.22
  4. Step 4: Simplify right side
    21,780.28x = 228,373,423.29
  5. Step 5: Solve for x
    x = 228,373,423.29/21,780.28
  6. Step 6: Final answer
    x = 10,485.33

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Similar ratio
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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.