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Finding the Fourth Proportional to 131,145.40, 196,718.10 and 128,958.40

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Solution

The fourth proportional to 131,145.40, 196,718.10 and 128,958.40 is: 193,437.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,145.40 : 196,718.10 = 128,958.40 : x
  2. Step 2: Convert to fraction form
    131,145.40/196,718.10 = 128,958.40/x
  3. Step 3: Cross multiply
    131,145.40x = 196,718.10 × 128,958.40
  4. Step 4: Simplify right side
    131,145.40x = 25,368,451,427.04
  5. Step 5: Solve for x
    x = 25,368,451,427.04/131,145.40
  6. Step 6: Final answer
    x = 193,437.60

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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.