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Finding the Fourth Proportional to 1,248,600.80, 1,869,733.20 and 687,000.80

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Solution

The fourth proportional to 1,248,600.80, 1,869,733.20 and 687,000.80 is: 1,028,758.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248,600.80 : 1,869,733.20 = 687,000.80 : x
  2. Step 2: Convert to fraction form
    1,248,600.80/1,869,733.20 = 687,000.80/x
  3. Step 3: Cross multiply
    1,248,600.80x = 1,869,733.20 × 687,000.80
  4. Step 4: Simplify right side
    1,248,600.80x = 1,284,508,204,186.56
  5. Step 5: Solve for x
    x = 1,284,508,204,186.56/1,248,600.80
  6. Step 6: Final answer
    x = 1,028,758.11

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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.