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Finding the Fourth Proportional to 111,689.28, 153,951.44 and 91,510.56

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Solution

The fourth proportional to 111,689.28, 153,951.44 and 91,510.56 is: 126,137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,689.28 : 153,951.44 = 91,510.56 : x
  2. Step 2: Convert to fraction form
    111,689.28/153,951.44 = 91,510.56/x
  3. Step 3: Cross multiply
    111,689.28x = 153,951.44 × 91,510.56
  4. Step 4: Simplify right side
    111,689.28x = 14,088,182,029.65
  5. Step 5: Solve for x
    x = 14,088,182,029.65/111,689.28
  6. Step 6: Final answer
    x = 126,137.28

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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.