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Finding the Fourth Proportional to 153,728.25, 212,144.99 and 86,660.25

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Solution

The fourth proportional to 153,728.25, 212,144.99 and 86,660.25 is: 119,591.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,728.25 : 212,144.99 = 86,660.25 : x
  2. Step 2: Convert to fraction form
    153,728.25/212,144.99 = 86,660.25/x
  3. Step 3: Cross multiply
    153,728.25x = 212,144.99 × 86,660.25
  4. Step 4: Simplify right side
    153,728.25x = 18,384,537,869.65
  5. Step 5: Solve for x
    x = 18,384,537,869.65/153,728.25
  6. Step 6: Final answer
    x = 119,591.15

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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.