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Finding the Fourth Proportional to 86,466.87, 128,840.74 and 77,034.41

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Solution

The fourth proportional to 86,466.87, 128,840.74 and 77,034.41 is: 114,785.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,466.87 : 128,840.74 = 77,034.41 : x
  2. Step 2: Convert to fraction form
    86,466.87/128,840.74 = 77,034.41/x
  3. Step 3: Cross multiply
    86,466.87x = 128,840.74 × 77,034.41
  4. Step 4: Simplify right side
    86,466.87x = 9,925,170,036.23
  5. Step 5: Solve for x
    x = 9,925,170,036.23/86,466.87
  6. Step 6: Final answer
    x = 114,785.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.