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Finding the Fourth Proportional to 127,921.80, 191,709.90 and 85,681.80

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Solution

The fourth proportional to 127,921.80, 191,709.90 and 85,681.80 is: 128,406.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,921.80 : 191,709.90 = 85,681.80 : x
  2. Step 2: Convert to fraction form
    127,921.80/191,709.90 = 85,681.80/x
  3. Step 3: Cross multiply
    127,921.80x = 191,709.90 × 85,681.80
  4. Step 4: Simplify right side
    127,921.80x = 16,426,049,309.82
  5. Step 5: Solve for x
    x = 16,426,049,309.82/127,921.80
  6. Step 6: Final answer
    x = 128,406.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.