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Finding the Fourth Proportional to 1,287,789.49, 1,931,435.12 and 647,922.07

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Solution

The fourth proportional to 1,287,789.49, 1,931,435.12 and 647,922.07 is: 971,757.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,789.49 : 1,931,435.12 = 647,922.07 : x
  2. Step 2: Convert to fraction form
    1,287,789.49/1,931,435.12 = 647,922.07/x
  3. Step 3: Cross multiply
    1,287,789.49x = 1,931,435.12 × 647,922.07
  4. Step 4: Simplify right side
    1,287,789.49x = 1,251,419,448,686.90
  5. Step 5: Solve for x
    x = 1,251,419,448,686.90/1,287,789.49
  6. Step 6: Final answer
    x = 971,757.77

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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.