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Finding the Fourth Proportional to 790.80, 1,185.74 and 242.83

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Solution

The fourth proportional to 790.80, 1,185.74 and 242.83 is: 364.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.80 : 1,185.74 = 242.83 : x
  2. Step 2: Convert to fraction form
    790.80/1,185.74 = 242.83/x
  3. Step 3: Cross multiply
    790.80x = 1,185.74 × 242.83
  4. Step 4: Simplify right side
    790.80x = 287,934.42
  5. Step 5: Solve for x
    x = 287,934.42/790.80
  6. Step 6: Final answer
    x = 364.11

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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.