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Finding the Fourth Proportional to 398,118.75, 549,403.88 and 219,270.75

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Solution

The fourth proportional to 398,118.75, 549,403.88 and 219,270.75 is: 302,593.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,118.75 : 549,403.88 = 219,270.75 : x
  2. Step 2: Convert to fraction form
    398,118.75/549,403.88 = 219,270.75/x
  3. Step 3: Cross multiply
    398,118.75x = 549,403.88 × 219,270.75
  4. Step 4: Simplify right side
    398,118.75x = 120,468,199,724.16
  5. Step 5: Solve for x
    x = 120,468,199,724.16/398,118.75
  6. Step 6: Final answer
    x = 302,593.64

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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.