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Finding the Fourth Proportional to 1,208.80, 1,813.20 and 387.08

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Solution

The fourth proportional to 1,208.80, 1,813.20 and 387.08 is: 580.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.80 : 1,813.20 = 387.08 : x
  2. Step 2: Convert to fraction form
    1,208.80/1,813.20 = 387.08/x
  3. Step 3: Cross multiply
    1,208.80x = 1,813.20 × 387.08
  4. Step 4: Simplify right side
    1,208.80x = 701,853.46
  5. Step 5: Solve for x
    x = 701,853.46/1,208.80
  6. Step 6: Final answer
    x = 580.62

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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.