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Finding the Fourth Proportional to 756.30, 1,135.17 and 391.35

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Solution

The fourth proportional to 756.30, 1,135.17 and 391.35 is: 587.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.30 : 1,135.17 = 391.35 : x
  2. Step 2: Convert to fraction form
    756.30/1,135.17 = 391.35/x
  3. Step 3: Cross multiply
    756.30x = 1,135.17 × 391.35
  4. Step 4: Simplify right side
    756.30x = 444,248.78
  5. Step 5: Solve for x
    x = 444,248.78/756.30
  6. Step 6: Final answer
    x = 587.40

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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.