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Finding the Fourth Proportional to 189,681.89, 261,883.05 and 121,728.16

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Solution

The fourth proportional to 189,681.89, 261,883.05 and 121,728.16 is: 168,063.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,681.89 : 261,883.05 = 121,728.16 : x
  2. Step 2: Convert to fraction form
    189,681.89/261,883.05 = 121,728.16/x
  3. Step 3: Cross multiply
    189,681.89x = 261,883.05 × 121,728.16
  4. Step 4: Simplify right side
    189,681.89x = 31,878,541,156.98
  5. Step 5: Solve for x
    x = 31,878,541,156.98/189,681.89
  6. Step 6: Final answer
    x = 168,063.18

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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.