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Finding the Fourth Proportional to 86,572.60, 129,858.90 and 39,916.60

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Solution

The fourth proportional to 86,572.60, 129,858.90 and 39,916.60 is: 59,874.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,572.60 : 129,858.90 = 39,916.60 : x
  2. Step 2: Convert to fraction form
    86,572.60/129,858.90 = 39,916.60/x
  3. Step 3: Cross multiply
    86,572.60x = 129,858.90 × 39,916.60
  4. Step 4: Simplify right side
    86,572.60x = 5,183,525,767.74
  5. Step 5: Solve for x
    x = 5,183,525,767.74/86,572.60
  6. Step 6: Final answer
    x = 59,874.90

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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.