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Finding the Fourth Proportional to 66,449.76, 91,690.20 and 39,591.60

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Solution

The fourth proportional to 66,449.76, 91,690.20 and 39,591.60 is: 54,630.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,449.76 : 91,690.20 = 39,591.60 : x
  2. Step 2: Convert to fraction form
    66,449.76/91,690.20 = 39,591.60/x
  3. Step 3: Cross multiply
    66,449.76x = 91,690.20 × 39,591.60
  4. Step 4: Simplify right side
    66,449.76x = 3,630,161,722.32
  5. Step 5: Solve for x
    x = 3,630,161,722.32/66,449.76
  6. Step 6: Final answer
    x = 54,630.17

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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.