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Finding the Fourth Proportional to 786.15, 1,178.89 and 395.91

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Solution

The fourth proportional to 786.15, 1,178.89 and 395.91 is: 593.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.15 : 1,178.89 = 395.91 : x
  2. Step 2: Convert to fraction form
    786.15/1,178.89 = 395.91/x
  3. Step 3: Cross multiply
    786.15x = 1,178.89 × 395.91
  4. Step 4: Simplify right side
    786.15x = 466,734.34
  5. Step 5: Solve for x
    x = 466,734.34/786.15
  6. Step 6: Final answer
    x = 593.70

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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.