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Finding the Fourth Proportional to 1,210.28, 1,812.17 and 722.39

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Solution

The fourth proportional to 1,210.28, 1,812.17 and 722.39 is: 1,081.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.28 : 1,812.17 = 722.39 : x
  2. Step 2: Convert to fraction form
    1,210.28/1,812.17 = 722.39/x
  3. Step 3: Cross multiply
    1,210.28x = 1,812.17 × 722.39
  4. Step 4: Simplify right side
    1,210.28x = 1,309,086.23
  5. Step 5: Solve for x
    x = 1,309,086.23/1,210.28
  6. Step 6: Final answer
    x = 1,081.64

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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.