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Finding the Fourth Proportional to 18,781,297.20, 28,171,945.80 and 18,403,383.60

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Solution

The fourth proportional to 18,781,297.20, 28,171,945.80 and 18,403,383.60 is: 27,605,075.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781,297.20 : 28,171,945.80 = 18,403,383.60 : x
  2. Step 2: Convert to fraction form
    18,781,297.20/28,171,945.80 = 18,403,383.60/x
  3. Step 3: Cross multiply
    18,781,297.20x = 28,171,945.80 × 18,403,383.60
  4. Step 4: Simplify right side
    18,781,297.20x = 518,459,125,315,808.94
  5. Step 5: Solve for x
    x = 518,459,125,315,808.94/18,781,297.20
  6. Step 6: Final answer
    x = 27,605,075.40

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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.