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Finding the Fourth Proportional to 213,720.70, 320,581.05 and 210,610.30

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Solution

The fourth proportional to 213,720.70, 320,581.05 and 210,610.30 is: 315,915.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,720.70 : 320,581.05 = 210,610.30 : x
  2. Step 2: Convert to fraction form
    213,720.70/320,581.05 = 210,610.30/x
  3. Step 3: Cross multiply
    213,720.70x = 320,581.05 × 210,610.30
  4. Step 4: Simplify right side
    213,720.70x = 67,517,671,114.82
  5. Step 5: Solve for x
    x = 67,517,671,114.82/213,720.70
  6. Step 6: Final answer
    x = 315,915.45

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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.