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Finding the Fourth Proportional to 1,163.74, 1,605 and 790.11

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Solution

The fourth proportional to 1,163.74, 1,605 and 790.11 is: 1,089.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.74 : 1,605 = 790.11 : x
  2. Step 2: Convert to fraction form
    1,163.74/1,605 = 790.11/x
  3. Step 3: Cross multiply
    1,163.74x = 1,605 × 790.11
  4. Step 4: Simplify right side
    1,163.74x = 1,268,126.55
  5. Step 5: Solve for x
    x = 1,268,126.55/1,163.74
  6. Step 6: Final answer
    x = 1,089.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.