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Finding the Fourth Proportional to 639,399.78, 882,379.02 and 352,920.09

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Solution

The fourth proportional to 639,399.78, 882,379.02 and 352,920.09 is: 487,033.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,399.78 : 882,379.02 = 352,920.09 : x
  2. Step 2: Convert to fraction form
    639,399.78/882,379.02 = 352,920.09/x
  3. Step 3: Cross multiply
    639,399.78x = 882,379.02 × 352,920.09
  4. Step 4: Simplify right side
    639,399.78x = 311,409,283,152.51
  5. Step 5: Solve for x
    x = 311,409,283,152.51/639,399.78
  6. Step 6: Final answer
    x = 487,033.77

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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.