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Finding the Fourth Proportional to 1,191.29, 1,643.65 and 719.08

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Solution

The fourth proportional to 1,191.29, 1,643.65 and 719.08 is: 992.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.29 : 1,643.65 = 719.08 : x
  2. Step 2: Convert to fraction form
    1,191.29/1,643.65 = 719.08/x
  3. Step 3: Cross multiply
    1,191.29x = 1,643.65 × 719.08
  4. Step 4: Simplify right side
    1,191.29x = 1,181,909.94
  5. Step 5: Solve for x
    x = 1,181,909.94/1,191.29
  6. Step 6: Final answer
    x = 992.13

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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.