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Finding the Fourth Proportional to 121,900.70, 168,240.92 and 74,144.81

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Solution

The fourth proportional to 121,900.70, 168,240.92 and 74,144.81 is: 102,330.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,900.70 : 168,240.92 = 74,144.81 : x
  2. Step 2: Convert to fraction form
    121,900.70/168,240.92 = 74,144.81/x
  3. Step 3: Cross multiply
    121,900.70x = 168,240.92 × 74,144.81
  4. Step 4: Simplify right side
    121,900.70x = 12,474,189,835.70
  5. Step 5: Solve for x
    x = 12,474,189,835.70/121,900.70
  6. Step 6: Final answer
    x = 102,330.75

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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.