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Finding the Fourth Proportional to 1,070.49, 1,476.11 and 696.78

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Solution

The fourth proportional to 1,070.49, 1,476.11 and 696.78 is: 960.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.49 : 1,476.11 = 696.78 : x
  2. Step 2: Convert to fraction form
    1,070.49/1,476.11 = 696.78/x
  3. Step 3: Cross multiply
    1,070.49x = 1,476.11 × 696.78
  4. Step 4: Simplify right side
    1,070.49x = 1,028,529.36
  5. Step 5: Solve for x
    x = 1,028,529.36/1,070.49
  6. Step 6: Final answer
    x = 960.80

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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.