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Finding the Fourth Proportional to 66,338.64, 91,539.60 and 39,489.84

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Solution

The fourth proportional to 66,338.64, 91,539.60 and 39,489.84 is: 54,491.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,338.64 : 91,539.60 = 39,489.84 : x
  2. Step 2: Convert to fraction form
    66,338.64/91,539.60 = 39,489.84/x
  3. Step 3: Cross multiply
    66,338.64x = 91,539.60 × 39,489.84
  4. Step 4: Simplify right side
    66,338.64x = 3,614,884,157.66
  5. Step 5: Solve for x
    x = 3,614,884,157.66/66,338.64
  6. Step 6: Final answer
    x = 54,491.38

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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.