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Finding the Fourth Proportional to 1,191.21, 1,643.56 and 719.37

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Solution

The fourth proportional to 1,191.21, 1,643.56 and 719.37 is: 992.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.21 : 1,643.56 = 719.37 : x
  2. Step 2: Convert to fraction form
    1,191.21/1,643.56 = 719.37/x
  3. Step 3: Cross multiply
    1,191.21x = 1,643.56 × 719.37
  4. Step 4: Simplify right side
    1,191.21x = 1,182,325.96
  5. Step 5: Solve for x
    x = 1,182,325.96/1,191.21
  6. Step 6: Final answer
    x = 992.55

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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.