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Finding the Fourth Proportional to 665,774.40, 998,078.40 and 399,640.80

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Solution

The fourth proportional to 665,774.40, 998,078.40 and 399,640.80 is: 599,111.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,774.40 : 998,078.40 = 399,640.80 : x
  2. Step 2: Convert to fraction form
    665,774.40/998,078.40 = 399,640.80/x
  3. Step 3: Cross multiply
    665,774.40x = 998,078.40 × 399,640.80
  4. Step 4: Simplify right side
    665,774.40x = 398,872,850,238.72
  5. Step 5: Solve for x
    x = 398,872,850,238.72/665,774.40
  6. Step 6: Final answer
    x = 599,111.13

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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.