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Finding the Fourth Proportional to 853.92, 1,274.24 and 756.72

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Solution

The fourth proportional to 853.92, 1,274.24 and 756.72 is: 1,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.92 : 1,274.24 = 756.72 : x
  2. Step 2: Convert to fraction form
    853.92/1,274.24 = 756.72/x
  3. Step 3: Cross multiply
    853.92x = 1,274.24 × 756.72
  4. Step 4: Simplify right side
    853.92x = 964,242.89
  5. Step 5: Solve for x
    x = 964,242.89/853.92
  6. Step 6: Final answer
    x = 1,129.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.