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Finding the Fourth Proportional to 1,210.62, 1,816.07 and 388.61

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Solution

The fourth proportional to 1,210.62, 1,816.07 and 388.61 is: 582.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.62 : 1,816.07 = 388.61 : x
  2. Step 2: Convert to fraction form
    1,210.62/1,816.07 = 388.61/x
  3. Step 3: Cross multiply
    1,210.62x = 1,816.07 × 388.61
  4. Step 4: Simplify right side
    1,210.62x = 705,731.94
  5. Step 5: Solve for x
    x = 705,731.94/1,210.62
  6. Step 6: Final answer
    x = 582.95

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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.