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Finding the Fourth Proportional to 399,230.80, 598,846.20 and 257,513.20

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Solution

The fourth proportional to 399,230.80, 598,846.20 and 257,513.20 is: 386,269.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,230.80 : 598,846.20 = 257,513.20 : x
  2. Step 2: Convert to fraction form
    399,230.80/598,846.20 = 257,513.20/x
  3. Step 3: Cross multiply
    399,230.80x = 598,846.20 × 257,513.20
  4. Step 4: Simplify right side
    399,230.80x = 154,210,801,269.84
  5. Step 5: Solve for x
    x = 154,210,801,269.84/399,230.80
  6. Step 6: Final answer
    x = 386,269.80

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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.