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Finding the Fourth Proportional to 100,431.94, 138,597.69 and 57,994.18

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Solution

The fourth proportional to 100,431.94, 138,597.69 and 57,994.18 is: 80,032.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,431.94 : 138,597.69 = 57,994.18 : x
  2. Step 2: Convert to fraction form
    100,431.94/138,597.69 = 57,994.18/x
  3. Step 3: Cross multiply
    100,431.94x = 138,597.69 × 57,994.18
  4. Step 4: Simplify right side
    100,431.94x = 8,037,859,381.44
  5. Step 5: Solve for x
    x = 8,037,859,381.44/100,431.94
  6. Step 6: Final answer
    x = 80,032.90

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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.