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Finding the Fourth Proportional to 77,163.40, 115,745.10 and 21,759.40

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Solution

The fourth proportional to 77,163.40, 115,745.10 and 21,759.40 is: 32,639.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,163.40 : 115,745.10 = 21,759.40 : x
  2. Step 2: Convert to fraction form
    77,163.40/115,745.10 = 21,759.40/x
  3. Step 3: Cross multiply
    77,163.40x = 115,745.10 × 21,759.40
  4. Step 4: Simplify right side
    77,163.40x = 2,518,543,928.94
  5. Step 5: Solve for x
    x = 2,518,543,928.94/77,163.40
  6. Step 6: Final answer
    x = 32,639.10

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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.