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Finding the Fourth Proportional to 619,961.08, 855,949.74 and 378,383.69

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Solution

The fourth proportional to 619,961.08, 855,949.74 and 378,383.69 is: 522,415.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,961.08 : 855,949.74 = 378,383.69 : x
  2. Step 2: Convert to fraction form
    619,961.08/855,949.74 = 378,383.69/x
  3. Step 3: Cross multiply
    619,961.08x = 855,949.74 × 378,383.69
  4. Step 4: Simplify right side
    619,961.08x = 323,877,421,075.74
  5. Step 5: Solve for x
    x = 323,877,421,075.74/619,961.08
  6. Step 6: Final answer
    x = 522,415.73

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Double scale
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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.