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Finding the Fourth Proportional to 378,010.20, 567,015.30 and 128,692.20

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Solution

The fourth proportional to 378,010.20, 567,015.30 and 128,692.20 is: 193,038.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,010.20 : 567,015.30 = 128,692.20 : x
  2. Step 2: Convert to fraction form
    378,010.20/567,015.30 = 128,692.20/x
  3. Step 3: Cross multiply
    378,010.20x = 567,015.30 × 128,692.20
  4. Step 4: Simplify right side
    378,010.20x = 72,970,446,390.66
  5. Step 5: Solve for x
    x = 72,970,446,390.66/378,010.20
  6. Step 6: Final answer
    x = 193,038.30

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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.