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Finding the Fourth Proportional to 687,772.80, 1,029,690.90 and 609,040.80

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Solution

The fourth proportional to 687,772.80, 1,029,690.90 and 609,040.80 is: 911,818.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,772.80 : 1,029,690.90 = 609,040.80 : x
  2. Step 2: Convert to fraction form
    687,772.80/1,029,690.90 = 609,040.80/x
  3. Step 3: Cross multiply
    687,772.80x = 1,029,690.90 × 609,040.80
  4. Step 4: Simplify right side
    687,772.80x = 627,123,769,488.72
  5. Step 5: Solve for x
    x = 627,123,769,488.72/687,772.80
  6. Step 6: Final answer
    x = 911,818.22

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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.