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Finding the Fourth Proportional to 100,612.47, 138,797.35 and 72,334.56

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Solution

The fourth proportional to 100,612.47, 138,797.35 and 72,334.56 is: 99,787.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,612.47 : 138,797.35 = 72,334.56 : x
  2. Step 2: Convert to fraction form
    100,612.47/138,797.35 = 72,334.56/x
  3. Step 3: Cross multiply
    100,612.47x = 138,797.35 × 72,334.56
  4. Step 4: Simplify right side
    100,612.47x = 10,039,845,241.42
  5. Step 5: Solve for x
    x = 10,039,845,241.42/100,612.47
  6. Step 6: Final answer
    x = 99,787.29

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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.