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Finding the Fourth Proportional to 1,259,859.80, 1,889,789.70 and 811,087.40

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Solution

The fourth proportional to 1,259,859.80, 1,889,789.70 and 811,087.40 is: 1,216,631.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259,859.80 : 1,889,789.70 = 811,087.40 : x
  2. Step 2: Convert to fraction form
    1,259,859.80/1,889,789.70 = 811,087.40/x
  3. Step 3: Cross multiply
    1,259,859.80x = 1,889,789.70 × 811,087.40
  4. Step 4: Simplify right side
    1,259,859.80x = 1,532,784,614,319.78
  5. Step 5: Solve for x
    x = 1,532,784,614,319.78/1,259,859.80
  6. Step 6: Final answer
    x = 1,216,631.10

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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.