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Finding the Fourth Proportional to 813,872.80, 1,220,809.20 and 680,903.20

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Solution

The fourth proportional to 813,872.80, 1,220,809.20 and 680,903.20 is: 1,021,354.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,872.80 : 1,220,809.20 = 680,903.20 : x
  2. Step 2: Convert to fraction form
    813,872.80/1,220,809.20 = 680,903.20/x
  3. Step 3: Cross multiply
    813,872.80x = 1,220,809.20 × 680,903.20
  4. Step 4: Simplify right side
    813,872.80x = 831,252,890,869.44
  5. Step 5: Solve for x
    x = 831,252,890,869.44/813,872.80
  6. Step 6: Final answer
    x = 1,021,354.80

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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.