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Finding the Fourth Proportional to 790.35, 1,090.45 and 495.61

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Solution

The fourth proportional to 790.35, 1,090.45 and 495.61 is: 683.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.35 : 1,090.45 = 495.61 : x
  2. Step 2: Convert to fraction form
    790.35/1,090.45 = 495.61/x
  3. Step 3: Cross multiply
    790.35x = 1,090.45 × 495.61
  4. Step 4: Simplify right side
    790.35x = 540,437.92
  5. Step 5: Solve for x
    x = 540,437.92/790.35
  6. Step 6: Final answer
    x = 683.80

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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.