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Finding the Fourth Proportional to 398,408.45, 549,803.66 and 219,560.45

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Solution

The fourth proportional to 398,408.45, 549,803.66 and 219,560.45 is: 302,993.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,408.45 : 549,803.66 = 219,560.45 : x
  2. Step 2: Convert to fraction form
    398,408.45/549,803.66 = 219,560.45/x
  3. Step 3: Cross multiply
    398,408.45x = 549,803.66 × 219,560.45
  4. Step 4: Simplify right side
    398,408.45x = 120,715,135,154.43
  5. Step 5: Solve for x
    x = 120,715,135,154.43/398,408.45
  6. Step 6: Final answer
    x = 302,993.41

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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.