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Finding the Fourth Proportional to 398,408.50, 549,803.74 and 219,560.50

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Solution

The fourth proportional to 398,408.50, 549,803.74 and 219,560.50 is: 302,993.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,408.50 : 549,803.74 = 219,560.50 : x
  2. Step 2: Convert to fraction form
    398,408.50/549,803.74 = 219,560.50/x
  3. Step 3: Cross multiply
    398,408.50x = 549,803.74 × 219,560.50
  4. Step 4: Simplify right side
    398,408.50x = 120,715,184,605.17
  5. Step 5: Solve for x
    x = 120,715,184,605.17/398,408.50
  6. Step 6: Final answer
    x = 302,993.50

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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.