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Finding the Fourth Proportional to 85,783.78, 128,533.41 and 60,699.49

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Solution

The fourth proportional to 85,783.78, 128,533.41 and 60,699.49 is: 90,948.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,783.78 : 128,533.41 = 60,699.49 : x
  2. Step 2: Convert to fraction form
    85,783.78/128,533.41 = 60,699.49/x
  3. Step 3: Cross multiply
    85,783.78x = 128,533.41 × 60,699.49
  4. Step 4: Simplify right side
    85,783.78x = 7,801,912,434.96
  5. Step 5: Solve for x
    x = 7,801,912,434.96/85,783.78
  6. Step 6: Final answer
    x = 90,948.57

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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.