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Finding the Fourth Proportional to 1,210.22, 1,815.99 and 480.31

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Solution

The fourth proportional to 1,210.22, 1,815.99 and 480.31 is: 720.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.22 : 1,815.99 = 480.31 : x
  2. Step 2: Convert to fraction form
    1,210.22/1,815.99 = 480.31/x
  3. Step 3: Cross multiply
    1,210.22x = 1,815.99 × 480.31
  4. Step 4: Simplify right side
    1,210.22x = 872,229.08
  5. Step 5: Solve for x
    x = 872,229.08/1,210.22
  6. Step 6: Final answer
    x = 720.72

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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.