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Finding the Fourth Proportional to 851.36, 1,277.20 and 338.40

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Solution

The fourth proportional to 851.36, 1,277.20 and 338.40 is: 507.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.36 : 1,277.20 = 338.40 : x
  2. Step 2: Convert to fraction form
    851.36/1,277.20 = 338.40/x
  3. Step 3: Cross multiply
    851.36x = 1,277.20 × 338.40
  4. Step 4: Simplify right side
    851.36x = 432,204.48
  5. Step 5: Solve for x
    x = 432,204.48/851.36
  6. Step 6: Final answer
    x = 507.66

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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.