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Finding the Fourth Proportional to 1,191.41, 1,643.90 and 693.90

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Solution

The fourth proportional to 1,191.41, 1,643.90 and 693.90 is: 957.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.41 : 1,643.90 = 693.90 : x
  2. Step 2: Convert to fraction form
    1,191.41/1,643.90 = 693.90/x
  3. Step 3: Cross multiply
    1,191.41x = 1,643.90 × 693.90
  4. Step 4: Simplify right side
    1,191.41x = 1,140,698.74
  5. Step 5: Solve for x
    x = 1,140,698.74/1,191.41
  6. Step 6: Final answer
    x = 957.44

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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.