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Finding the Fourth Proportional to 660,628.80, 990,943.20 and 394,908.30

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Solution

The fourth proportional to 660,628.80, 990,943.20 and 394,908.30 is: 592,362.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,628.80 : 990,943.20 = 394,908.30 : x
  2. Step 2: Convert to fraction form
    660,628.80/990,943.20 = 394,908.30/x
  3. Step 3: Cross multiply
    660,628.80x = 990,943.20 × 394,908.30
  4. Step 4: Simplify right side
    660,628.80x = 391,331,694,508.56
  5. Step 5: Solve for x
    x = 391,331,694,508.56/660,628.80
  6. Step 6: Final answer
    x = 592,362.45

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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.