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Finding the Fourth Proportional to 140,381.15, 193,739.33 and 76,728.51

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Solution

The fourth proportional to 140,381.15, 193,739.33 and 76,728.51 is: 105,892.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,381.15 : 193,739.33 = 76,728.51 : x
  2. Step 2: Convert to fraction form
    140,381.15/193,739.33 = 76,728.51/x
  3. Step 3: Cross multiply
    140,381.15x = 193,739.33 × 76,728.51
  4. Step 4: Simplify right side
    140,381.15x = 14,865,330,311.12
  5. Step 5: Solve for x
    x = 14,865,330,311.12/140,381.15
  6. Step 6: Final answer
    x = 105,892.64

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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.