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Finding the Fourth Proportional to 1,812.13, 2,717.55 and 716.20

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Solution

The fourth proportional to 1,812.13, 2,717.55 and 716.20 is: 1,074.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.13 : 2,717.55 = 716.20 : x
  2. Step 2: Convert to fraction form
    1,812.13/2,717.55 = 716.20/x
  3. Step 3: Cross multiply
    1,812.13x = 2,717.55 × 716.20
  4. Step 4: Simplify right side
    1,812.13x = 1,946,309.31
  5. Step 5: Solve for x
    x = 1,946,309.31/1,812.13
  6. Step 6: Final answer
    x = 1,074.05

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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.