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Finding the Fourth Proportional to 1,178.85, 1,768.74 and 357.21

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Solution

The fourth proportional to 1,178.85, 1,768.74 and 357.21 is: 535.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.85 : 1,768.74 = 357.21 : x
  2. Step 2: Convert to fraction form
    1,178.85/1,768.74 = 357.21/x
  3. Step 3: Cross multiply
    1,178.85x = 1,768.74 × 357.21
  4. Step 4: Simplify right side
    1,178.85x = 631,811.62
  5. Step 5: Solve for x
    x = 631,811.62/1,178.85
  6. Step 6: Final answer
    x = 535.96

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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.