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Finding the Fourth Proportional to 1,091.76, 1,505.64 and 718.62

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Solution

The fourth proportional to 1,091.76, 1,505.64 and 718.62 is: 991.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.76 : 1,505.64 = 718.62 : x
  2. Step 2: Convert to fraction form
    1,091.76/1,505.64 = 718.62/x
  3. Step 3: Cross multiply
    1,091.76x = 1,505.64 × 718.62
  4. Step 4: Simplify right side
    1,091.76x = 1,081,983.02
  5. Step 5: Solve for x
    x = 1,081,983.02/1,091.76
  6. Step 6: Final answer
    x = 991.04

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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.