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Finding the Fourth Proportional to 790.20, 1,090.64 and 495.64

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Solution

The fourth proportional to 790.20, 1,090.64 and 495.64 is: 684.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,090.64 = 495.64 : x
  2. Step 2: Convert to fraction form
    790.20/1,090.64 = 495.64/x
  3. Step 3: Cross multiply
    790.20x = 1,090.64 × 495.64
  4. Step 4: Simplify right side
    790.20x = 540,564.81
  5. Step 5: Solve for x
    x = 540,564.81/790.20
  6. Step 6: Final answer
    x = 684.09

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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.