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Finding the Fourth Proportional to 210,535.80, 315,650.10 and 85,812.60

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Solution

The fourth proportional to 210,535.80, 315,650.10 and 85,812.60 is: 128,656.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,535.80 : 315,650.10 = 85,812.60 : x
  2. Step 2: Convert to fraction form
    210,535.80/315,650.10 = 85,812.60/x
  3. Step 3: Cross multiply
    210,535.80x = 315,650.10 × 85,812.60
  4. Step 4: Simplify right side
    210,535.80x = 27,086,755,771.26
  5. Step 5: Solve for x
    x = 27,086,755,771.26/210,535.80
  6. Step 6: Final answer
    x = 128,656.29

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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.