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Finding the Fourth Proportional to 330,628.80, 495,943.20 and 212,530.80

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Solution

The fourth proportional to 330,628.80, 495,943.20 and 212,530.80 is: 318,796.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    330,628.80 : 495,943.20 = 212,530.80 : x
  2. Step 2: Convert to fraction form
    330,628.80/495,943.20 = 212,530.80/x
  3. Step 3: Cross multiply
    330,628.80x = 495,943.20 × 212,530.80
  4. Step 4: Simplify right side
    330,628.80x = 105,403,205,050.56
  5. Step 5: Solve for x
    x = 105,403,205,050.56/330,628.80
  6. Step 6: Final answer
    x = 318,796.20

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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.