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Finding the Fourth Proportional to 66,197.79, 99,447.35 and 39,919.77

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Solution

The fourth proportional to 66,197.79, 99,447.35 and 39,919.77 is: 59,970.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,197.79 : 99,447.35 = 39,919.77 : x
  2. Step 2: Convert to fraction form
    66,197.79/99,447.35 = 39,919.77/x
  3. Step 3: Cross multiply
    66,197.79x = 99,447.35 × 39,919.77
  4. Step 4: Simplify right side
    66,197.79x = 3,969,915,139.51
  5. Step 5: Solve for x
    x = 3,969,915,139.51/66,197.79
  6. Step 6: Final answer
    x = 59,970.51

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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.