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Finding the Fourth Proportional to 1,190.69, 1,643.05 and 718.66

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Solution

The fourth proportional to 1,190.69, 1,643.05 and 718.66 is: 991.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.69 : 1,643.05 = 718.66 : x
  2. Step 2: Convert to fraction form
    1,190.69/1,643.05 = 718.66/x
  3. Step 3: Cross multiply
    1,190.69x = 1,643.05 × 718.66
  4. Step 4: Simplify right side
    1,190.69x = 1,180,794.31
  5. Step 5: Solve for x
    x = 1,180,794.31/1,190.69
  6. Step 6: Final answer
    x = 991.69

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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.