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Finding the Fourth Proportional to 1,033.71, 1,551.41 and 687.21

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Solution

The fourth proportional to 1,033.71, 1,551.41 and 687.21 is: 1,031.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,033.71 : 1,551.41 = 687.21 : x
  2. Step 2: Convert to fraction form
    1,033.71/1,551.41 = 687.21/x
  3. Step 3: Cross multiply
    1,033.71x = 1,551.41 × 687.21
  4. Step 4: Simplify right side
    1,033.71x = 1,066,144.47
  5. Step 5: Solve for x
    x = 1,066,144.47/1,033.71
  6. Step 6: Final answer
    x = 1,031.38

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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.