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Finding the Fourth Proportional to 790.87, 1,186.56 and 380.03

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Solution

The fourth proportional to 790.87, 1,186.56 and 380.03 is: 570.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.87 : 1,186.56 = 380.03 : x
  2. Step 2: Convert to fraction form
    790.87/1,186.56 = 380.03/x
  3. Step 3: Cross multiply
    790.87x = 1,186.56 × 380.03
  4. Step 4: Simplify right side
    790.87x = 450,930.95
  5. Step 5: Solve for x
    x = 450,930.95/790.87
  6. Step 6: Final answer
    x = 570.17

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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.