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Finding the Fourth Proportional to 934.68, 1,400.20 and 687.43

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Solution

The fourth proportional to 934.68, 1,400.20 and 687.43 is: 1,029.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.68 : 1,400.20 = 687.43 : x
  2. Step 2: Convert to fraction form
    934.68/1,400.20 = 687.43/x
  3. Step 3: Cross multiply
    934.68x = 1,400.20 × 687.43
  4. Step 4: Simplify right side
    934.68x = 962,539.49
  5. Step 5: Solve for x
    x = 962,539.49/934.68
  6. Step 6: Final answer
    x = 1,029.81

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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.