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Finding the Fourth Proportional to 20,472.69, 30,707.58 and 7,990.38

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Solution

The fourth proportional to 20,472.69, 30,707.58 and 7,990.38 is: 11,985.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,472.69 : 30,707.58 = 7,990.38 : x
  2. Step 2: Convert to fraction form
    20,472.69/30,707.58 = 7,990.38/x
  3. Step 3: Cross multiply
    20,472.69x = 30,707.58 × 7,990.38
  4. Step 4: Simplify right side
    20,472.69x = 245,365,233.08
  5. Step 5: Solve for x
    x = 245,365,233.08/20,472.69
  6. Step 6: Final answer
    x = 11,985.00

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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.