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Finding the Fourth Proportional to 86,136.90, 129,205.35 and 79,916.10

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Solution

The fourth proportional to 86,136.90, 129,205.35 and 79,916.10 is: 119,874.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,136.90 : 129,205.35 = 79,916.10 : x
  2. Step 2: Convert to fraction form
    86,136.90/129,205.35 = 79,916.10/x
  3. Step 3: Cross multiply
    86,136.90x = 129,205.35 × 79,916.10
  4. Step 4: Simplify right side
    86,136.90x = 10,325,587,671.14
  5. Step 5: Solve for x
    x = 10,325,587,671.14/86,136.90
  6. Step 6: Final answer
    x = 119,874.15

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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.