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Finding the Fourth Proportional to 210,516.80, 315,621.60 and 85,793.60

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Solution

The fourth proportional to 210,516.80, 315,621.60 and 85,793.60 is: 128,627.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,516.80 : 315,621.60 = 85,793.60 : x
  2. Step 2: Convert to fraction form
    210,516.80/315,621.60 = 85,793.60/x
  3. Step 3: Cross multiply
    210,516.80x = 315,621.60 × 85,793.60
  4. Step 4: Simplify right side
    210,516.80x = 27,078,313,301.76
  5. Step 5: Solve for x
    x = 27,078,313,301.76/210,516.80
  6. Step 6: Final answer
    x = 128,627.80

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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.