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Finding the Fourth Proportional to 189,681.98, 261,651.53 and 121,674.78

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Solution

The fourth proportional to 189,681.98, 261,651.53 and 121,674.78 is: 167,840.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,681.98 : 261,651.53 = 121,674.78 : x
  2. Step 2: Convert to fraction form
    189,681.98/261,651.53 = 121,674.78/x
  3. Step 3: Cross multiply
    189,681.98x = 261,651.53 × 121,674.78
  4. Step 4: Simplify right side
    189,681.98x = 31,836,392,653.60
  5. Step 5: Solve for x
    x = 31,836,392,653.60/189,681.98
  6. Step 6: Final answer
    x = 167,840.90

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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.