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Finding the Fourth Proportional to 757.41, 1,135.85 and 386.87

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Solution

The fourth proportional to 757.41, 1,135.85 and 386.87 is: 580.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.41 : 1,135.85 = 386.87 : x
  2. Step 2: Convert to fraction form
    757.41/1,135.85 = 386.87/x
  3. Step 3: Cross multiply
    757.41x = 1,135.85 × 386.87
  4. Step 4: Simplify right side
    757.41x = 439,420.61
  5. Step 5: Solve for x
    x = 439,420.61/757.41
  6. Step 6: Final answer
    x = 580.16

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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.