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Finding the Fourth Proportional to 612,091.20, 918,136.80 and 543,856.80

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Solution

The fourth proportional to 612,091.20, 918,136.80 and 543,856.80 is: 815,785.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,091.20 : 918,136.80 = 543,856.80 : x
  2. Step 2: Convert to fraction form
    612,091.20/918,136.80 = 543,856.80/x
  3. Step 3: Cross multiply
    612,091.20x = 918,136.80 × 543,856.80
  4. Step 4: Simplify right side
    612,091.20x = 499,334,942,010.24
  5. Step 5: Solve for x
    x = 499,334,942,010.24/612,091.20
  6. Step 6: Final answer
    x = 815,785.20

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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.