Home / 491,943.20-678,929.90-287,981.75

Finding the Fourth Proportional to 491,943.20, 678,929.90 and 287,981.75

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Solution

The fourth proportional to 491,943.20, 678,929.90 and 287,981.75 is: 397,443.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,943.20 : 678,929.90 = 287,981.75 : x
  2. Step 2: Convert to fraction form
    491,943.20/678,929.90 = 287,981.75/x
  3. Step 3: Cross multiply
    491,943.20x = 678,929.90 × 287,981.75
  4. Step 4: Simplify right side
    491,943.20x = 195,519,415,894.77
  5. Step 5: Solve for x
    x = 195,519,415,894.77/491,943.20
  6. Step 6: Final answer
    x = 397,443.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.