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Finding the Fourth Proportional to 85,779.78, 128,527.40 and 60,695.49

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Solution

The fourth proportional to 85,779.78, 128,527.40 and 60,695.49 is: 90,942.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,779.78 : 128,527.40 = 60,695.49 : x
  2. Step 2: Convert to fraction form
    85,779.78/128,527.40 = 60,695.49/x
  3. Step 3: Cross multiply
    85,779.78x = 128,527.40 × 60,695.49
  4. Step 4: Simplify right side
    85,779.78x = 7,801,033,217.95
  5. Step 5: Solve for x
    x = 7,801,033,217.95/85,779.78
  6. Step 6: Final answer
    x = 90,942.56

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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.