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Finding the Fourth Proportional to 1,311.26, 1,808.52 and 957.12

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Solution

The fourth proportional to 1,311.26, 1,808.52 and 957.12 is: 1,320.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.26 : 1,808.52 = 957.12 : x
  2. Step 2: Convert to fraction form
    1,311.26/1,808.52 = 957.12/x
  3. Step 3: Cross multiply
    1,311.26x = 1,808.52 × 957.12
  4. Step 4: Simplify right side
    1,311.26x = 1,730,970.66
  5. Step 5: Solve for x
    x = 1,730,970.66/1,311.26
  6. Step 6: Final answer
    x = 1,320.09

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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.