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Finding the Fourth Proportional to 398,218.90, 549,541.84 and 219,370.90

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Solution

The fourth proportional to 398,218.90, 549,541.84 and 219,370.90 is: 302,731.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,218.90 : 549,541.84 = 219,370.90 : x
  2. Step 2: Convert to fraction form
    398,218.90/549,541.84 = 219,370.90/x
  3. Step 3: Cross multiply
    398,218.90x = 549,541.84 × 219,370.90
  4. Step 4: Simplify right side
    398,218.90x = 120,553,488,028.46
  5. Step 5: Solve for x
    x = 120,553,488,028.46/398,218.90
  6. Step 6: Final answer
    x = 302,731.71

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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.