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Finding the Fourth Proportional to 1,163.40, 1,605.47 and 771.15

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Solution

The fourth proportional to 1,163.40, 1,605.47 and 771.15 is: 1,064.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.40 : 1,605.47 = 771.15 : x
  2. Step 2: Convert to fraction form
    1,163.40/1,605.47 = 771.15/x
  3. Step 3: Cross multiply
    1,163.40x = 1,605.47 × 771.15
  4. Step 4: Simplify right side
    1,163.40x = 1,238,064.69
  5. Step 5: Solve for x
    x = 1,238,064.69/1,163.40
  6. Step 6: Final answer
    x = 1,064.18

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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.