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Finding the Fourth Proportional to 61,683.92, 85,039.12 and 39,011.60

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Solution

The fourth proportional to 61,683.92, 85,039.12 and 39,011.60 is: 53,782.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,683.92 : 85,039.12 = 39,011.60 : x
  2. Step 2: Convert to fraction form
    61,683.92/85,039.12 = 39,011.60/x
  3. Step 3: Cross multiply
    61,683.92x = 85,039.12 × 39,011.60
  4. Step 4: Simplify right side
    61,683.92x = 3,317,512,133.79
  5. Step 5: Solve for x
    x = 3,317,512,133.79/61,683.92
  6. Step 6: Final answer
    x = 53,782.45

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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.