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Finding the Fourth Proportional to 60,900.45, 91,361.16 and 20,917.54

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Solution

The fourth proportional to 60,900.45, 91,361.16 and 20,917.54 is: 31,379.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,900.45 : 91,361.16 = 20,917.54 : x
  2. Step 2: Convert to fraction form
    60,900.45/91,361.16 = 20,917.54/x
  3. Step 3: Cross multiply
    60,900.45x = 91,361.16 × 20,917.54
  4. Step 4: Simplify right side
    60,900.45x = 1,911,050,718.75
  5. Step 5: Solve for x
    x = 1,911,050,718.75/60,900.45
  6. Step 6: Final answer
    x = 31,379.91

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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.