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Finding the Fourth Proportional to 800.25, 1,200.98 and 389.62

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Solution

The fourth proportional to 800.25, 1,200.98 and 389.62 is: 584.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.25 : 1,200.98 = 389.62 : x
  2. Step 2: Convert to fraction form
    800.25/1,200.98 = 389.62/x
  3. Step 3: Cross multiply
    800.25x = 1,200.98 × 389.62
  4. Step 4: Simplify right side
    800.25x = 467,925.83
  5. Step 5: Solve for x
    x = 467,925.83/800.25
  6. Step 6: Final answer
    x = 584.72

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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.