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Finding the Fourth Proportional to 398,396.13, 549,786.65 and 219,548.13

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Solution

The fourth proportional to 398,396.13, 549,786.65 and 219,548.13 is: 302,976.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,396.13 : 549,786.65 = 219,548.13 : x
  2. Step 2: Convert to fraction form
    398,396.13/549,786.65 = 219,548.13/x
  3. Step 3: Cross multiply
    398,396.13x = 549,786.65 × 219,548.13
  4. Step 4: Simplify right side
    398,396.13x = 120,704,630,906.47
  5. Step 5: Solve for x
    x = 120,704,630,906.47/398,396.13
  6. Step 6: Final answer
    x = 302,976.41

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1.5x scale

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.