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Finding the Fourth Proportional to 1,125.21, 1,686.76 and 394.31

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Solution

The fourth proportional to 1,125.21, 1,686.76 and 394.31 is: 591.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.21 : 1,686.76 = 394.31 : x
  2. Step 2: Convert to fraction form
    1,125.21/1,686.76 = 394.31/x
  3. Step 3: Cross multiply
    1,125.21x = 1,686.76 × 394.31
  4. Step 4: Simplify right side
    1,125.21x = 665,109.57
  5. Step 5: Solve for x
    x = 665,109.57/1,125.21
  6. Step 6: Final answer
    x = 591.10

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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.