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Finding the Fourth Proportional to 872,463.20, 1,308,781.20 and 303,756.80

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Solution

The fourth proportional to 872,463.20, 1,308,781.20 and 303,756.80 is: 455,665.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    872,463.20 : 1,308,781.20 = 303,756.80 : x
  2. Step 2: Convert to fraction form
    872,463.20/1,308,781.20 = 303,756.80/x
  3. Step 3: Cross multiply
    872,463.20x = 1,308,781.20 × 303,756.80
  4. Step 4: Simplify right side
    872,463.20x = 397,551,189,212.16
  5. Step 5: Solve for x
    x = 397,551,189,212.16/872,463.20
  6. Step 6: Final answer
    x = 455,665.28

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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.