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Finding the Fourth Proportional to 100,393.31, 138,541.48 and 57,372.31

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Solution

The fourth proportional to 100,393.31, 138,541.48 and 57,372.31 is: 79,173.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,393.31 : 138,541.48 = 57,372.31 : x
  2. Step 2: Convert to fraction form
    100,393.31/138,541.48 = 57,372.31/x
  3. Step 3: Cross multiply
    100,393.31x = 138,541.48 × 57,372.31
  4. Step 4: Simplify right side
    100,393.31x = 7,948,444,590.07
  5. Step 5: Solve for x
    x = 7,948,444,590.07/100,393.31
  6. Step 6: Final answer
    x = 79,173.05

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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.