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Finding the Fourth Proportional to 153,691.50, 212,133.15 and 86,662.38

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Solution

The fourth proportional to 153,691.50, 212,133.15 and 86,662.38 is: 119,616.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,691.50 : 212,133.15 = 86,662.38 : x
  2. Step 2: Convert to fraction form
    153,691.50/212,133.15 = 86,662.38/x
  3. Step 3: Cross multiply
    153,691.50x = 212,133.15 × 86,662.38
  4. Step 4: Simplify right side
    153,691.50x = 18,383,963,655.90
  5. Step 5: Solve for x
    x = 18,383,963,655.90/153,691.50
  6. Step 6: Final answer
    x = 119,616.01

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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.