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Finding the Fourth Proportional to 386,400.80, 579,601.20 and 353,223.20

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Solution

The fourth proportional to 386,400.80, 579,601.20 and 353,223.20 is: 529,834.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,400.80 : 579,601.20 = 353,223.20 : x
  2. Step 2: Convert to fraction form
    386,400.80/579,601.20 = 353,223.20/x
  3. Step 3: Cross multiply
    386,400.80x = 579,601.20 × 353,223.20
  4. Step 4: Simplify right side
    386,400.80x = 204,728,590,587.84
  5. Step 5: Solve for x
    x = 204,728,590,587.84/386,400.80
  6. Step 6: Final answer
    x = 529,834.80

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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.