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Finding the Fourth Proportional to 1,210.91, 1,816.59 and 389.12

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Solution

The fourth proportional to 1,210.91, 1,816.59 and 389.12 is: 583.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.91 : 1,816.59 = 389.12 : x
  2. Step 2: Convert to fraction form
    1,210.91/1,816.59 = 389.12/x
  3. Step 3: Cross multiply
    1,210.91x = 1,816.59 × 389.12
  4. Step 4: Simplify right side
    1,210.91x = 706,863.88
  5. Step 5: Solve for x
    x = 706,863.88/1,210.91
  6. Step 6: Final answer
    x = 583.75

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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.