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Finding the Fourth Proportional to 20,484.99, 30,720.65 and 8,001.78

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Solution

The fourth proportional to 20,484.99, 30,720.65 and 8,001.78 is: 12,000.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,484.99 : 30,720.65 = 8,001.78 : x
  2. Step 2: Convert to fraction form
    20,484.99/30,720.65 = 8,001.78/x
  3. Step 3: Cross multiply
    20,484.99x = 30,720.65 × 8,001.78
  4. Step 4: Simplify right side
    20,484.99x = 245,819,882.76
  5. Step 5: Solve for x
    x = 245,819,882.76/20,484.99
  6. Step 6: Final answer
    x = 12,000.00

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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.