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Finding the Fourth Proportional to 100,131.53, 138,181.53 and 54,809.72

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Solution

The fourth proportional to 100,131.53, 138,181.53 and 54,809.72 is: 75,637.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,131.53 : 138,181.53 = 54,809.72 : x
  2. Step 2: Convert to fraction form
    100,131.53/138,181.53 = 54,809.72/x
  3. Step 3: Cross multiply
    100,131.53x = 138,181.53 × 54,809.72
  4. Step 4: Simplify right side
    100,131.53x = 7,573,690,968.47
  5. Step 5: Solve for x
    x = 7,573,690,968.47/100,131.53
  6. Step 6: Final answer
    x = 75,637.42

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1.5x scale

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.