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Finding the Fourth Proportional to 1,688.28, 2,532.66 and 822

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Solution

The fourth proportional to 1,688.28, 2,532.66 and 822 is: 1,233.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.28 : 2,532.66 = 822 : x
  2. Step 2: Convert to fraction form
    1,688.28/2,532.66 = 822/x
  3. Step 3: Cross multiply
    1,688.28x = 2,532.66 × 822
  4. Step 4: Simplify right side
    1,688.28x = 2,081,846.52
  5. Step 5: Solve for x
    x = 2,081,846.52/1,688.28
  6. Step 6: Final answer
    x = 1,233.12

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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.