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Finding the Fourth Proportional to 1,210.83, 1,815.84 and 388.91

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Solution

The fourth proportional to 1,210.83, 1,815.84 and 388.91 is: 583.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.83 : 1,815.84 = 388.91 : x
  2. Step 2: Convert to fraction form
    1,210.83/1,815.84 = 388.91/x
  3. Step 3: Cross multiply
    1,210.83x = 1,815.84 × 388.91
  4. Step 4: Simplify right side
    1,210.83x = 706,198.86
  5. Step 5: Solve for x
    x = 706,198.86/1,210.83
  6. Step 6: Final answer
    x = 583.23

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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.