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Finding the Fourth Proportional to 86,303.72, 129,389.34 and 77,511.80

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Solution

The fourth proportional to 86,303.72, 129,389.34 and 77,511.80 is: 116,208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,303.72 : 129,389.34 = 77,511.80 : x
  2. Step 2: Convert to fraction form
    86,303.72/129,389.34 = 77,511.80/x
  3. Step 3: Cross multiply
    86,303.72x = 129,389.34 × 77,511.80
  4. Step 4: Simplify right side
    86,303.72x = 10,029,200,644.21
  5. Step 5: Solve for x
    x = 10,029,200,644.21/86,303.72
  6. Step 6: Final answer
    x = 116,208.21

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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.