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Finding the Fourth Proportional to 756.71, 1,135.20 and 345.89

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Solution

The fourth proportional to 756.71, 1,135.20 and 345.89 is: 518.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.71 : 1,135.20 = 345.89 : x
  2. Step 2: Convert to fraction form
    756.71/1,135.20 = 345.89/x
  3. Step 3: Cross multiply
    756.71x = 1,135.20 × 345.89
  4. Step 4: Simplify right side
    756.71x = 392,658.46
  5. Step 5: Solve for x
    x = 392,658.46/756.71
  6. Step 6: Final answer
    x = 518.90

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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.