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Finding the Fourth Proportional to 790.09, 1,090.20 and 475.28

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Solution

The fourth proportional to 790.09, 1,090.20 and 475.28 is: 655.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.09 : 1,090.20 = 475.28 : x
  2. Step 2: Convert to fraction form
    790.09/1,090.20 = 475.28/x
  3. Step 3: Cross multiply
    790.09x = 1,090.20 × 475.28
  4. Step 4: Simplify right side
    790.09x = 518,150.26
  5. Step 5: Solve for x
    x = 518,150.26/790.09
  6. Step 6: Final answer
    x = 655.81

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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.