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Finding the Fourth Proportional to 790.20, 1,090.26 and 615.24

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Solution

The fourth proportional to 790.20, 1,090.26 and 615.24 is: 848.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.20 : 1,090.26 = 615.24 : x
  2. Step 2: Convert to fraction form
    790.20/1,090.26 = 615.24/x
  3. Step 3: Cross multiply
    790.20x = 1,090.26 × 615.24
  4. Step 4: Simplify right side
    790.20x = 670,771.56
  5. Step 5: Solve for x
    x = 670,771.56/790.20
  6. Step 6: Final answer
    x = 848.86

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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.