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Finding the Fourth Proportional to 1,286.55, 1,773.62 and 913.39

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Solution

The fourth proportional to 1,286.55, 1,773.62 and 913.39 is: 1,259.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.55 : 1,773.62 = 913.39 : x
  2. Step 2: Convert to fraction form
    1,286.55/1,773.62 = 913.39/x
  3. Step 3: Cross multiply
    1,286.55x = 1,773.62 × 913.39
  4. Step 4: Simplify right side
    1,286.55x = 1,620,011.21
  5. Step 5: Solve for x
    x = 1,620,011.21/1,286.55
  6. Step 6: Final answer
    x = 1,259.19

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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.