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Finding the Fourth Proportional to 605,978.20, 907,655.10 and 393,401.80

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Solution

The fourth proportional to 605,978.20, 907,655.10 and 393,401.80 is: 589,250.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,978.20 : 907,655.10 = 393,401.80 : x
  2. Step 2: Convert to fraction form
    605,978.20/907,655.10 = 393,401.80/x
  3. Step 3: Cross multiply
    605,978.20x = 907,655.10 × 393,401.80
  4. Step 4: Simplify right side
    605,978.20x = 357,073,150,119.18
  5. Step 5: Solve for x
    x = 357,073,150,119.18/605,978.20
  6. Step 6: Final answer
    x = 589,250.82

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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.