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Finding the Fourth Proportional to 120,987.12, 166,965.12 and 67,274.40

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Solution

The fourth proportional to 120,987.12, 166,965.12 and 67,274.40 is: 92,840.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,987.12 : 166,965.12 = 67,274.40 : x
  2. Step 2: Convert to fraction form
    120,987.12/166,965.12 = 67,274.40/x
  3. Step 3: Cross multiply
    120,987.12x = 166,965.12 × 67,274.40
  4. Step 4: Simplify right side
    120,987.12x = 11,232,478,268.93
  5. Step 5: Solve for x
    x = 11,232,478,268.93/120,987.12
  6. Step 6: Final answer
    x = 92,840.28

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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.