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Finding the Fourth Proportional to 757.15, 1,134.71 and 345.87

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Solution

The fourth proportional to 757.15, 1,134.71 and 345.87 is: 518.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.15 : 1,134.71 = 345.87 : x
  2. Step 2: Convert to fraction form
    757.15/1,134.71 = 345.87/x
  3. Step 3: Cross multiply
    757.15x = 1,134.71 × 345.87
  4. Step 4: Simplify right side
    757.15x = 392,461.72
  5. Step 5: Solve for x
    x = 392,461.72/757.15
  6. Step 6: Final answer
    x = 518.34

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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.