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Finding the Fourth Proportional to 85,785.53, 128,626.35 and 38,391.79

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Solution

The fourth proportional to 85,785.53, 128,626.35 and 38,391.79 is: 57,564.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,785.53 : 128,626.35 = 38,391.79 : x
  2. Step 2: Convert to fraction form
    85,785.53/128,626.35 = 38,391.79/x
  3. Step 3: Cross multiply
    85,785.53x = 128,626.35 × 38,391.79
  4. Step 4: Simplify right side
    85,785.53x = 4,938,195,625.71
  5. Step 5: Solve for x
    x = 4,938,195,625.71/85,785.53
  6. Step 6: Final answer
    x = 57,564.44

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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.