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Finding the Fourth Proportional to 1,209.29, 1,812.63 and 515.84

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Solution

The fourth proportional to 1,209.29, 1,812.63 and 515.84 is: 773.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.29 : 1,812.63 = 515.84 : x
  2. Step 2: Convert to fraction form
    1,209.29/1,812.63 = 515.84/x
  3. Step 3: Cross multiply
    1,209.29x = 1,812.63 × 515.84
  4. Step 4: Simplify right side
    1,209.29x = 935,027.06
  5. Step 5: Solve for x
    x = 935,027.06/1,209.29
  6. Step 6: Final answer
    x = 773.20

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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.