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Finding the Fourth Proportional to 638,711.87, 957,278.86 and 548,117.78

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Solution

The fourth proportional to 638,711.87, 957,278.86 and 548,117.78 is: 821,499.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,711.87 : 957,278.86 = 548,117.78 : x
  2. Step 2: Convert to fraction form
    638,711.87/957,278.86 = 548,117.78/x
  3. Step 3: Cross multiply
    638,711.87x = 957,278.86 × 548,117.78
  4. Step 4: Simplify right side
    638,711.87x = 524,701,557,427.44
  5. Step 5: Solve for x
    x = 524,701,557,427.44/638,711.87
  6. Step 6: Final answer
    x = 821,499.62

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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.