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Finding the Fourth Proportional to 1,210.12, 1,814.62 and 388.22

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Solution

The fourth proportional to 1,210.12, 1,814.62 and 388.22 is: 582.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.12 : 1,814.62 = 388.22 : x
  2. Step 2: Convert to fraction form
    1,210.12/1,814.62 = 388.22/x
  3. Step 3: Cross multiply
    1,210.12x = 1,814.62 × 388.22
  4. Step 4: Simplify right side
    1,210.12x = 704,471.78
  5. Step 5: Solve for x
    x = 704,471.78/1,210.12
  6. Step 6: Final answer
    x = 582.15

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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.