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Finding the Fourth Proportional to 255,621.20, 383,431.80 and 145,029.20

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Solution

The fourth proportional to 255,621.20, 383,431.80 and 145,029.20 is: 217,543.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,621.20 : 383,431.80 = 145,029.20 : x
  2. Step 2: Convert to fraction form
    255,621.20/383,431.80 = 145,029.20/x
  3. Step 3: Cross multiply
    255,621.20x = 383,431.80 × 145,029.20
  4. Step 4: Simplify right side
    255,621.20x = 55,608,807,208.56
  5. Step 5: Solve for x
    x = 55,608,807,208.56/255,621.20
  6. Step 6: Final answer
    x = 217,543.80

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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.