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Finding the Fourth Proportional to 666,145.20, 999,217.80 and 311,851.20

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Solution

The fourth proportional to 666,145.20, 999,217.80 and 311,851.20 is: 467,776.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,145.20 : 999,217.80 = 311,851.20 : x
  2. Step 2: Convert to fraction form
    666,145.20/999,217.80 = 311,851.20/x
  3. Step 3: Cross multiply
    666,145.20x = 999,217.80 × 311,851.20
  4. Step 4: Simplify right side
    666,145.20x = 311,607,269,991.36
  5. Step 5: Solve for x
    x = 311,607,269,991.36/666,145.20
  6. Step 6: Final answer
    x = 467,776.80

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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.