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Finding the Fourth Proportional to 1,190.28, 1,642.75 and 718.20

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Solution

The fourth proportional to 1,190.28, 1,642.75 and 718.20 is: 991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.28 : 1,642.75 = 718.20 : x
  2. Step 2: Convert to fraction form
    1,190.28/1,642.75 = 718.20/x
  3. Step 3: Cross multiply
    1,190.28x = 1,642.75 × 718.20
  4. Step 4: Simplify right side
    1,190.28x = 1,179,823.05
  5. Step 5: Solve for x
    x = 1,179,823.05/1,190.28
  6. Step 6: Final answer
    x = 991.21

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1.5x scale

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.