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Finding the Fourth Proportional to 811,939.20, 1,217,908.80 and 811,939.20

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Solution

The fourth proportional to 811,939.20, 1,217,908.80 and 811,939.20 is: 1,217,908.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,939.20 : 1,217,908.80 = 811,939.20 : x
  2. Step 2: Convert to fraction form
    811,939.20/1,217,908.80 = 811,939.20/x
  3. Step 3: Cross multiply
    811,939.20x = 1,217,908.80 × 811,939.20
  4. Step 4: Simplify right side
    811,939.20x = 988,867,896,744.96
  5. Step 5: Solve for x
    x = 988,867,896,744.96/811,939.20
  6. Step 6: Final answer
    x = 1,217,908.80

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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.