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Finding the Fourth Proportional to 1,299,758.80, 1,949,638.20 and 921,845.20

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Solution

The fourth proportional to 1,299,758.80, 1,949,638.20 and 921,845.20 is: 1,382,767.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299,758.80 : 1,949,638.20 = 921,845.20 : x
  2. Step 2: Convert to fraction form
    1,299,758.80/1,949,638.20 = 921,845.20/x
  3. Step 3: Cross multiply
    1,299,758.80x = 1,949,638.20 × 921,845.20
  4. Step 4: Simplify right side
    1,299,758.80x = 1,797,264,616,406.64
  5. Step 5: Solve for x
    x = 1,797,264,616,406.64/1,299,758.80
  6. Step 6: Final answer
    x = 1,382,767.80

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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.