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Finding the Fourth Proportional to 756.57, 1,134.45 and 345.45

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Solution

The fourth proportional to 756.57, 1,134.45 and 345.45 is: 517.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.57 : 1,134.45 = 345.45 : x
  2. Step 2: Convert to fraction form
    756.57/1,134.45 = 345.45/x
  3. Step 3: Cross multiply
    756.57x = 1,134.45 × 345.45
  4. Step 4: Simplify right side
    756.57x = 391,895.75
  5. Step 5: Solve for x
    x = 391,895.75/756.57
  6. Step 6: Final answer
    x = 517.99

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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.