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Finding the Fourth Proportional to 398,490.80, 598,427.40 and 211,866.80

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Solution

The fourth proportional to 398,490.80, 598,427.40 and 211,866.80 is: 318,167.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,490.80 : 598,427.40 = 211,866.80 : x
  2. Step 2: Convert to fraction form
    398,490.80/598,427.40 = 211,866.80/x
  3. Step 3: Cross multiply
    398,490.80x = 598,427.40 × 211,866.80
  4. Step 4: Simplify right side
    398,490.80x = 126,786,898,270.32
  5. Step 5: Solve for x
    x = 126,786,898,270.32/398,490.80
  6. Step 6: Final answer
    x = 318,167.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.