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Finding the Fourth Proportional to 1,191.74, 1,643.91 and 694.31

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Solution

The fourth proportional to 1,191.74, 1,643.91 and 694.31 is: 957.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.74 : 1,643.91 = 694.31 : x
  2. Step 2: Convert to fraction form
    1,191.74/1,643.91 = 694.31/x
  3. Step 3: Cross multiply
    1,191.74x = 1,643.91 × 694.31
  4. Step 4: Simplify right side
    1,191.74x = 1,141,374.93
  5. Step 5: Solve for x
    x = 1,141,374.93/1,191.74
  6. Step 6: Final answer
    x = 957.74

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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.