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Finding the Fourth Proportional to 756.90, 1,134.54 and 318.39

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Solution

The fourth proportional to 756.90, 1,134.54 and 318.39 is: 477.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.90 : 1,134.54 = 318.39 : x
  2. Step 2: Convert to fraction form
    756.90/1,134.54 = 318.39/x
  3. Step 3: Cross multiply
    756.90x = 1,134.54 × 318.39
  4. Step 4: Simplify right side
    756.90x = 361,226.19
  5. Step 5: Solve for x
    x = 361,226.19/756.90
  6. Step 6: Final answer
    x = 477.24

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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.