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Finding the Fourth Proportional to 398,452.75, 549,899.36 and 219,639.31

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Solution

The fourth proportional to 398,452.75, 549,899.36 and 219,639.31 is: 303,121.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,452.75 : 549,899.36 = 219,639.31 : x
  2. Step 2: Convert to fraction form
    398,452.75/549,899.36 = 219,639.31/x
  3. Step 3: Cross multiply
    398,452.75x = 549,899.36 × 219,639.31
  4. Step 4: Simplify right side
    398,452.75x = 120,779,515,999.84
  5. Step 5: Solve for x
    x = 120,779,515,999.84/398,452.75
  6. Step 6: Final answer
    x = 303,121.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.