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Finding the Fourth Proportional to 1,141.12, 1,708.04 and 811.25

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Solution

The fourth proportional to 1,141.12, 1,708.04 and 811.25 is: 1,214.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.12 : 1,708.04 = 811.25 : x
  2. Step 2: Convert to fraction form
    1,141.12/1,708.04 = 811.25/x
  3. Step 3: Cross multiply
    1,141.12x = 1,708.04 × 811.25
  4. Step 4: Simplify right side
    1,141.12x = 1,385,643.39
  5. Step 5: Solve for x
    x = 1,385,643.39/1,141.12
  6. Step 6: Final answer
    x = 1,214.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.