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Finding the Fourth Proportional to 425,327.80, 638,283.30 and 188,840.20

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Solution

The fourth proportional to 425,327.80, 638,283.30 and 188,840.20 is: 283,389.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,327.80 : 638,283.30 = 188,840.20 : x
  2. Step 2: Convert to fraction form
    425,327.80/638,283.30 = 188,840.20/x
  3. Step 3: Cross multiply
    425,327.80x = 638,283.30 × 188,840.20
  4. Step 4: Simplify right side
    425,327.80x = 120,533,546,028.66
  5. Step 5: Solve for x
    x = 120,533,546,028.66/425,327.80
  6. Step 6: Final answer
    x = 283,389.77

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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.