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Finding the Fourth Proportional to 1,191.23, 1,643.95 and 719.12

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Solution

The fourth proportional to 1,191.23, 1,643.95 and 719.12 is: 992.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.23 : 1,643.95 = 719.12 : x
  2. Step 2: Convert to fraction form
    1,191.23/1,643.95 = 719.12/x
  3. Step 3: Cross multiply
    1,191.23x = 1,643.95 × 719.12
  4. Step 4: Simplify right side
    1,191.23x = 1,182,189.10
  5. Step 5: Solve for x
    x = 1,182,189.10/1,191.23
  6. Step 6: Final answer
    x = 992.41

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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.