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Finding the Fourth Proportional to 191,960.40, 287,940.60 and 128,974.80

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Solution

The fourth proportional to 191,960.40, 287,940.60 and 128,974.80 is: 193,462.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,960.40 : 287,940.60 = 128,974.80 : x
  2. Step 2: Convert to fraction form
    191,960.40/287,940.60 = 128,974.80/x
  3. Step 3: Cross multiply
    191,960.40x = 287,940.60 × 128,974.80
  4. Step 4: Simplify right side
    191,960.40x = 37,137,081,296.88
  5. Step 5: Solve for x
    x = 37,137,081,296.88/191,960.40
  6. Step 6: Final answer
    x = 193,462.20

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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.