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Finding the Fourth Proportional to 1,190.54, 1,642.98 and 718.70

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Solution

The fourth proportional to 1,190.54, 1,642.98 and 718.70 is: 991.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.54 : 1,642.98 = 718.70 : x
  2. Step 2: Convert to fraction form
    1,190.54/1,642.98 = 718.70/x
  3. Step 3: Cross multiply
    1,190.54x = 1,642.98 × 718.70
  4. Step 4: Simplify right side
    1,190.54x = 1,180,809.73
  5. Step 5: Solve for x
    x = 1,180,809.73/1,190.54
  6. Step 6: Final answer
    x = 991.83

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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.