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Finding the Fourth Proportional to 404,427.20, 606,640.80 and 399,178.40

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Solution

The fourth proportional to 404,427.20, 606,640.80 and 399,178.40 is: 598,767.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    404,427.20 : 606,640.80 = 399,178.40 : x
  2. Step 2: Convert to fraction form
    404,427.20/606,640.80 = 399,178.40/x
  3. Step 3: Cross multiply
    404,427.20x = 606,640.80 × 399,178.40
  4. Step 4: Simplify right side
    404,427.20x = 242,157,903,918.72
  5. Step 5: Solve for x
    x = 242,157,903,918.72/404,427.20
  6. Step 6: Final answer
    x = 598,767.60

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Similar ratio
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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.