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Finding the Fourth Proportional to 790.50, 1,090.92 and 480

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Solution

The fourth proportional to 790.50, 1,090.92 and 480 is: 662.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.50 : 1,090.92 = 480 : x
  2. Step 2: Convert to fraction form
    790.50/1,090.92 = 480/x
  3. Step 3: Cross multiply
    790.50x = 1,090.92 × 480
  4. Step 4: Simplify right side
    790.50x = 523,641.60
  5. Step 5: Solve for x
    x = 523,641.60/790.50
  6. Step 6: Final answer
    x = 662.42

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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.