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Finding the Fourth Proportional to 61,912.60, 85,407.42 and 39,213.40

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Solution

The fourth proportional to 61,912.60, 85,407.42 and 39,213.40 is: 54,094.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,912.60 : 85,407.42 = 39,213.40 : x
  2. Step 2: Convert to fraction form
    61,912.60/85,407.42 = 39,213.40/x
  3. Step 3: Cross multiply
    61,912.60x = 85,407.42 × 39,213.40
  4. Step 4: Simplify right side
    61,912.60x = 3,349,115,323.43
  5. Step 5: Solve for x
    x = 3,349,115,323.43/61,912.60
  6. Step 6: Final answer
    x = 54,094.24

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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.