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Finding the Fourth Proportional to 756.28, 1,131.18 and 447.40

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Solution

The fourth proportional to 756.28, 1,131.18 and 447.40 is: 669.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.28 : 1,131.18 = 447.40 : x
  2. Step 2: Convert to fraction form
    756.28/1,131.18 = 447.40/x
  3. Step 3: Cross multiply
    756.28x = 1,131.18 × 447.40
  4. Step 4: Simplify right side
    756.28x = 506,089.93
  5. Step 5: Solve for x
    x = 506,089.93/756.28
  6. Step 6: Final answer
    x = 669.18

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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.