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Finding the Fourth Proportional to 790.89, 1,090.96 and 495.64

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Solution

The fourth proportional to 790.89, 1,090.96 and 495.64 is: 683.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.89 : 1,090.96 = 495.64 : x
  2. Step 2: Convert to fraction form
    790.89/1,090.96 = 495.64/x
  3. Step 3: Cross multiply
    790.89x = 1,090.96 × 495.64
  4. Step 4: Simplify right side
    790.89x = 540,723.41
  5. Step 5: Solve for x
    x = 540,723.41/790.89
  6. Step 6: Final answer
    x = 683.69

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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.