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Finding the Fourth Proportional to 399,378.80, 598,290.60 and 221,567.60

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Solution

The fourth proportional to 399,378.80, 598,290.60 and 221,567.60 is: 331,920.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,378.80 : 598,290.60 = 221,567.60 : x
  2. Step 2: Convert to fraction form
    399,378.80/598,290.60 = 221,567.60/x
  3. Step 3: Cross multiply
    399,378.80x = 598,290.60 × 221,567.60
  4. Step 4: Simplify right side
    399,378.80x = 132,561,812,344.56
  5. Step 5: Solve for x
    x = 132,561,812,344.56/399,378.80
  6. Step 6: Final answer
    x = 331,920.00

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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.