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Finding the Fourth Proportional to 66,091.97, 90,856.21 and 56,859.80

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Solution

The fourth proportional to 66,091.97, 90,856.21 and 56,859.80 is: 78,164.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,091.97 : 90,856.21 = 56,859.80 : x
  2. Step 2: Convert to fraction form
    66,091.97/90,856.21 = 56,859.80/x
  3. Step 3: Cross multiply
    66,091.97x = 90,856.21 × 56,859.80
  4. Step 4: Simplify right side
    66,091.97x = 5,166,065,588.65
  5. Step 5: Solve for x
    x = 5,166,065,588.65/66,091.97
  6. Step 6: Final answer
    x = 78,164.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.