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Finding the Fourth Proportional to 385,240.80, 577,861.20 and 361,912.80

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Solution

The fourth proportional to 385,240.80, 577,861.20 and 361,912.80 is: 542,869.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,240.80 : 577,861.20 = 361,912.80 : x
  2. Step 2: Convert to fraction form
    385,240.80/577,861.20 = 361,912.80/x
  3. Step 3: Cross multiply
    385,240.80x = 577,861.20 × 361,912.80
  4. Step 4: Simplify right side
    385,240.80x = 209,135,364,903.36
  5. Step 5: Solve for x
    x = 209,135,364,903.36/385,240.80
  6. Step 6: Final answer
    x = 542,869.20

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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.