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Finding the Fourth Proportional to 398,423.34, 549,808.20 and 217,131.39

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Solution

The fourth proportional to 398,423.34, 549,808.20 and 217,131.39 is: 299,632.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,423.34 : 549,808.20 = 217,131.39 : x
  2. Step 2: Convert to fraction form
    398,423.34/549,808.20 = 217,131.39/x
  3. Step 3: Cross multiply
    398,423.34x = 549,808.20 × 217,131.39
  4. Step 4: Simplify right side
    398,423.34x = 119,380,618,699.40
  5. Step 5: Solve for x
    x = 119,380,618,699.40/398,423.34
  6. Step 6: Final answer
    x = 299,632.59

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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.