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Finding the Fourth Proportional to 66,471.80, 91,708.08 and 42,611.64

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Solution

The fourth proportional to 66,471.80, 91,708.08 and 42,611.64 is: 58,789.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,471.80 : 91,708.08 = 42,611.64 : x
  2. Step 2: Convert to fraction form
    66,471.80/91,708.08 = 42,611.64/x
  3. Step 3: Cross multiply
    66,471.80x = 91,708.08 × 42,611.64
  4. Step 4: Simplify right side
    66,471.80x = 3,907,831,690.05
  5. Step 5: Solve for x
    x = 3,907,831,690.05/66,471.80
  6. Step 6: Final answer
    x = 58,789.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.