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Finding the Fourth Proportional to 725,578.40, 1,087,978.80 and 304,378.40

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Solution

The fourth proportional to 725,578.40, 1,087,978.80 and 304,378.40 is: 456,404.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    725,578.40 : 1,087,978.80 = 304,378.40 : x
  2. Step 2: Convert to fraction form
    725,578.40/1,087,978.80 = 304,378.40/x
  3. Step 3: Cross multiply
    725,578.40x = 1,087,978.80 × 304,378.40
  4. Step 4: Simplify right side
    725,578.40x = 331,157,246,377.92
  5. Step 5: Solve for x
    x = 331,157,246,377.92/725,578.40
  6. Step 6: Final answer
    x = 456,404.50

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1.5x scale

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.