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Finding the Fourth Proportional to 790.65, 1,090.62 and 495.39

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Solution

The fourth proportional to 790.65, 1,090.62 and 495.39 is: 683.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.65 : 1,090.62 = 495.39 : x
  2. Step 2: Convert to fraction form
    790.65/1,090.62 = 495.39/x
  3. Step 3: Cross multiply
    790.65x = 1,090.62 × 495.39
  4. Step 4: Simplify right side
    790.65x = 540,282.24
  5. Step 5: Solve for x
    x = 540,282.24/790.65
  6. Step 6: Final answer
    x = 683.34

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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.