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Finding the Fourth Proportional to 578,639.20, 867,958.80 and 487,400.80

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Solution

The fourth proportional to 578,639.20, 867,958.80 and 487,400.80 is: 731,101.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,639.20 : 867,958.80 = 487,400.80 : x
  2. Step 2: Convert to fraction form
    578,639.20/867,958.80 = 487,400.80/x
  3. Step 3: Cross multiply
    578,639.20x = 867,958.80 × 487,400.80
  4. Step 4: Simplify right side
    578,639.20x = 423,043,813,487.04
  5. Step 5: Solve for x
    x = 423,043,813,487.04/578,639.20
  6. Step 6: Final answer
    x = 731,101.20

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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.