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Finding the Fourth Proportional to 213,563.20, 320,344.80 and 172,091.20

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Solution

The fourth proportional to 213,563.20, 320,344.80 and 172,091.20 is: 258,136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,563.20 : 320,344.80 = 172,091.20 : x
  2. Step 2: Convert to fraction form
    213,563.20/320,344.80 = 172,091.20/x
  3. Step 3: Cross multiply
    213,563.20x = 320,344.80 × 172,091.20
  4. Step 4: Simplify right side
    213,563.20x = 55,128,521,045.76
  5. Step 5: Solve for x
    x = 55,128,521,045.76/213,563.20
  6. Step 6: Final answer
    x = 258,136.80

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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.