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Finding the Fourth Proportional to 1,090.46, 1,505.10 and 642.43

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Solution

The fourth proportional to 1,090.46, 1,505.10 and 642.43 is: 886.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.46 : 1,505.10 = 642.43 : x
  2. Step 2: Convert to fraction form
    1,090.46/1,505.10 = 642.43/x
  3. Step 3: Cross multiply
    1,090.46x = 1,505.10 × 642.43
  4. Step 4: Simplify right side
    1,090.46x = 966,921.39
  5. Step 5: Solve for x
    x = 966,921.39/1,090.46
  6. Step 6: Final answer
    x = 886.71

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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.