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Finding the Fourth Proportional to 687,751.80, 1,029,659.40 and 609,019.80

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Solution

The fourth proportional to 687,751.80, 1,029,659.40 and 609,019.80 is: 911,786.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,751.80 : 1,029,659.40 = 609,019.80 : x
  2. Step 2: Convert to fraction form
    687,751.80/1,029,659.40 = 609,019.80/x
  3. Step 3: Cross multiply
    687,751.80x = 1,029,659.40 × 609,019.80
  4. Step 4: Simplify right side
    687,751.80x = 627,082,961,856.12
  5. Step 5: Solve for x
    x = 627,082,961,856.12/687,751.80
  6. Step 6: Final answer
    x = 911,786.73

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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.