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Finding the Fourth Proportional to 210,626.80, 315,940.20 and 92,172.40

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Solution

The fourth proportional to 210,626.80, 315,940.20 and 92,172.40 is: 138,258.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,626.80 : 315,940.20 = 92,172.40 : x
  2. Step 2: Convert to fraction form
    210,626.80/315,940.20 = 92,172.40/x
  3. Step 3: Cross multiply
    210,626.80x = 315,940.20 × 92,172.40
  4. Step 4: Simplify right side
    210,626.80x = 29,120,966,490.48
  5. Step 5: Solve for x
    x = 29,120,966,490.48/210,626.80
  6. Step 6: Final answer
    x = 138,258.60

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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.