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Finding the Fourth Proportional to 790.35, 1,090.69 and 458.78

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Solution

The fourth proportional to 790.35, 1,090.69 and 458.78 is: 633.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.35 : 1,090.69 = 458.78 : x
  2. Step 2: Convert to fraction form
    790.35/1,090.69 = 458.78/x
  3. Step 3: Cross multiply
    790.35x = 1,090.69 × 458.78
  4. Step 4: Simplify right side
    790.35x = 500,388.34
  5. Step 5: Solve for x
    x = 500,388.34/790.35
  6. Step 6: Final answer
    x = 633.12

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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.