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Finding the Fourth Proportional to 1,274.26, 1,758.42 and 831.30

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Solution

The fourth proportional to 1,274.26, 1,758.42 and 831.30 is: 1,147.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.26 : 1,758.42 = 831.30 : x
  2. Step 2: Convert to fraction form
    1,274.26/1,758.42 = 831.30/x
  3. Step 3: Cross multiply
    1,274.26x = 1,758.42 × 831.30
  4. Step 4: Simplify right side
    1,274.26x = 1,461,774.55
  5. Step 5: Solve for x
    x = 1,461,774.55/1,274.26
  6. Step 6: Final answer
    x = 1,147.16

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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.