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Finding the Fourth Proportional to 1,178.59, 1,766.66 and 767.92

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Solution

The fourth proportional to 1,178.59, 1,766.66 and 767.92 is: 1,151.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.59 : 1,766.66 = 767.92 : x
  2. Step 2: Convert to fraction form
    1,178.59/1,766.66 = 767.92/x
  3. Step 3: Cross multiply
    1,178.59x = 1,766.66 × 767.92
  4. Step 4: Simplify right side
    1,178.59x = 1,356,653.55
  5. Step 5: Solve for x
    x = 1,356,653.55/1,178.59
  6. Step 6: Final answer
    x = 1,151.08

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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.