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Finding the Fourth Proportional to 640,569.60, 960,940.80 and 219,974.40

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Solution

The fourth proportional to 640,569.60, 960,940.80 and 219,974.40 is: 329,991.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,569.60 : 960,940.80 = 219,974.40 : x
  2. Step 2: Convert to fraction form
    640,569.60/960,940.80 = 219,974.40/x
  3. Step 3: Cross multiply
    640,569.60x = 960,940.80 × 219,974.40
  4. Step 4: Simplify right side
    640,569.60x = 211,382,375,915.52
  5. Step 5: Solve for x
    x = 211,382,375,915.52/640,569.60
  6. Step 6: Final answer
    x = 329,991.27

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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.