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Finding the Fourth Proportional to 129,657.20, 194,485.80 and 31,161.20

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Solution

The fourth proportional to 129,657.20, 194,485.80 and 31,161.20 is: 46,741.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,657.20 : 194,485.80 = 31,161.20 : x
  2. Step 2: Convert to fraction form
    129,657.20/194,485.80 = 31,161.20/x
  3. Step 3: Cross multiply
    129,657.20x = 194,485.80 × 31,161.20
  4. Step 4: Simplify right side
    129,657.20x = 6,060,409,938.53
  5. Step 5: Solve for x
    x = 6,060,409,938.53/129,657.20
  6. Step 6: Final answer
    x = 46,741.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.