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Finding the Fourth Proportional to 1,291.14, 1,782 and 731.64

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Solution

The fourth proportional to 1,291.14, 1,782 and 731.64 is: 1,009.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.14 : 1,782 = 731.64 : x
  2. Step 2: Convert to fraction form
    1,291.14/1,782 = 731.64/x
  3. Step 3: Cross multiply
    1,291.14x = 1,782 × 731.64
  4. Step 4: Simplify right side
    1,291.14x = 1,303,782.48
  5. Step 5: Solve for x
    x = 1,303,782.48/1,291.14
  6. Step 6: Final answer
    x = 1,009.79

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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.