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Finding the Fourth Proportional to 790.96, 1,090.56 and 659.92

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Solution

The fourth proportional to 790.96, 1,090.56 and 659.92 is: 909.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.96 : 1,090.56 = 659.92 : x
  2. Step 2: Convert to fraction form
    790.96/1,090.56 = 659.92/x
  3. Step 3: Cross multiply
    790.96x = 1,090.56 × 659.92
  4. Step 4: Simplify right side
    790.96x = 719,682.36
  5. Step 5: Solve for x
    x = 719,682.36/790.96
  6. Step 6: Final answer
    x = 909.88

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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.