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Finding the Fourth Proportional to 785.36, 1,178.37 and 265.43

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Solution

The fourth proportional to 785.36, 1,178.37 and 265.43 is: 398.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.36 : 1,178.37 = 265.43 : x
  2. Step 2: Convert to fraction form
    785.36/1,178.37 = 265.43/x
  3. Step 3: Cross multiply
    785.36x = 1,178.37 × 265.43
  4. Step 4: Simplify right side
    785.36x = 312,768.86
  5. Step 5: Solve for x
    x = 312,768.86/785.36
  6. Step 6: Final answer
    x = 398.25

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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.