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Finding the Fourth Proportional to 1,190.45, 1,642.83 and 718.37

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Solution

The fourth proportional to 1,190.45, 1,642.83 and 718.37 is: 991.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.45 : 1,642.83 = 718.37 : x
  2. Step 2: Convert to fraction form
    1,190.45/1,642.83 = 718.37/x
  3. Step 3: Cross multiply
    1,190.45x = 1,642.83 × 718.37
  4. Step 4: Simplify right side
    1,190.45x = 1,180,159.79
  5. Step 5: Solve for x
    x = 1,180,159.79/1,190.45
  6. Step 6: Final answer
    x = 991.36

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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.