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Finding the Fourth Proportional to 1,191.32, 1,643.76 and 719.24

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Solution

The fourth proportional to 1,191.32, 1,643.76 and 719.24 is: 992.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.32 : 1,643.76 = 719.24 : x
  2. Step 2: Convert to fraction form
    1,191.32/1,643.76 = 719.24/x
  3. Step 3: Cross multiply
    1,191.32x = 1,643.76 × 719.24
  4. Step 4: Simplify right side
    1,191.32x = 1,182,257.94
  5. Step 5: Solve for x
    x = 1,182,257.94/1,191.32
  6. Step 6: Final answer
    x = 992.39

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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.