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Finding the Fourth Proportional to 754.85, 1,131.51 and 511.40

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Solution

The fourth proportional to 754.85, 1,131.51 and 511.40 is: 766.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.85 : 1,131.51 = 511.40 : x
  2. Step 2: Convert to fraction form
    754.85/1,131.51 = 511.40/x
  3. Step 3: Cross multiply
    754.85x = 1,131.51 × 511.40
  4. Step 4: Simplify right side
    754.85x = 578,654.21
  5. Step 5: Solve for x
    x = 578,654.21/754.85
  6. Step 6: Final answer
    x = 766.58

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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.