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Finding the Fourth Proportional to 86,679.70, 130,019.55 and 49,815.70

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Solution

The fourth proportional to 86,679.70, 130,019.55 and 49,815.70 is: 74,723.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,679.70 : 130,019.55 = 49,815.70 : x
  2. Step 2: Convert to fraction form
    86,679.70/130,019.55 = 49,815.70/x
  3. Step 3: Cross multiply
    86,679.70x = 130,019.55 × 49,815.70
  4. Step 4: Simplify right side
    86,679.70x = 6,477,014,896.94
  5. Step 5: Solve for x
    x = 6,477,014,896.94/86,679.70
  6. Step 6: Final answer
    x = 74,723.55

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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.