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Finding the Fourth Proportional to 210,428.80, 315,643.20 and 131,785.60

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Solution

The fourth proportional to 210,428.80, 315,643.20 and 131,785.60 is: 197,678.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,428.80 : 315,643.20 = 131,785.60 : x
  2. Step 2: Convert to fraction form
    210,428.80/315,643.20 = 131,785.60/x
  3. Step 3: Cross multiply
    210,428.80x = 315,643.20 × 131,785.60
  4. Step 4: Simplify right side
    210,428.80x = 41,597,228,497.92
  5. Step 5: Solve for x
    x = 41,597,228,497.92/210,428.80
  6. Step 6: Final answer
    x = 197,678.40

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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.