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Finding the Fourth Proportional to 1,209.36, 1,812.87 and 478.92

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Solution

The fourth proportional to 1,209.36, 1,812.87 and 478.92 is: 717.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.36 : 1,812.87 = 478.92 : x
  2. Step 2: Convert to fraction form
    1,209.36/1,812.87 = 478.92/x
  3. Step 3: Cross multiply
    1,209.36x = 1,812.87 × 478.92
  4. Step 4: Simplify right side
    1,209.36x = 868,219.70
  5. Step 5: Solve for x
    x = 868,219.70/1,209.36
  6. Step 6: Final answer
    x = 717.92

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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.