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Finding the Fourth Proportional to 1,011.62, 1,396.42 and 790.64

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Solution

The fourth proportional to 1,011.62, 1,396.42 and 790.64 is: 1,091.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.62 : 1,396.42 = 790.64 : x
  2. Step 2: Convert to fraction form
    1,011.62/1,396.42 = 790.64/x
  3. Step 3: Cross multiply
    1,011.62x = 1,396.42 × 790.64
  4. Step 4: Simplify right side
    1,011.62x = 1,104,066.23
  5. Step 5: Solve for x
    x = 1,104,066.23/1,011.62
  6. Step 6: Final answer
    x = 1,091.39

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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.