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Finding the Fourth Proportional to 398,516.40, 549,945.48 and 217,229.88

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Solution

The fourth proportional to 398,516.40, 549,945.48 and 217,229.88 is: 299,773.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,516.40 : 549,945.48 = 217,229.88 : x
  2. Step 2: Convert to fraction form
    398,516.40/549,945.48 = 217,229.88/x
  3. Step 3: Cross multiply
    398,516.40x = 549,945.48 × 217,229.88
  4. Step 4: Simplify right side
    398,516.40x = 119,464,590,626.94
  5. Step 5: Solve for x
    x = 119,464,590,626.94/398,516.40
  6. Step 6: Final answer
    x = 299,773.34

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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.