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Finding the Fourth Proportional to 389,616.80, 584,425.20 and 319,575.20

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Solution

The fourth proportional to 389,616.80, 584,425.20 and 319,575.20 is: 479,362.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,616.80 : 584,425.20 = 319,575.20 : x
  2. Step 2: Convert to fraction form
    389,616.80/584,425.20 = 319,575.20/x
  3. Step 3: Cross multiply
    389,616.80x = 584,425.20 × 319,575.20
  4. Step 4: Simplify right side
    389,616.80x = 186,767,800,175.04
  5. Step 5: Solve for x
    x = 186,767,800,175.04/389,616.80
  6. Step 6: Final answer
    x = 479,362.80

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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.