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Finding the Fourth Proportional to 640,570.60, 960,942.30 and 219,975.40

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Solution

The fourth proportional to 640,570.60, 960,942.30 and 219,975.40 is: 329,992.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,570.60 : 960,942.30 = 219,975.40 : x
  2. Step 2: Convert to fraction form
    640,570.60/960,942.30 = 219,975.40/x
  3. Step 3: Cross multiply
    640,570.60x = 960,942.30 × 219,975.40
  4. Step 4: Simplify right side
    640,570.60x = 211,383,666,819.42
  5. Step 5: Solve for x
    x = 211,383,666,819.42/640,570.60
  6. Step 6: Final answer
    x = 329,992.77

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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.