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Finding the Fourth Proportional to 161,872.70, 242,879.10 and 86,905.40

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Solution

The fourth proportional to 161,872.70, 242,879.10 and 86,905.40 is: 130,395.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,872.70 : 242,879.10 = 86,905.40 : x
  2. Step 2: Convert to fraction form
    161,872.70/242,879.10 = 86,905.40/x
  3. Step 3: Cross multiply
    161,872.70x = 242,879.10 × 86,905.40
  4. Step 4: Simplify right side
    161,872.70x = 21,107,505,337.14
  5. Step 5: Solve for x
    x = 21,107,505,337.14/161,872.70
  6. Step 6: Final answer
    x = 130,395.71

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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.