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Finding the Fourth Proportional to 86,984.70, 130,116.60 and 81,671.10

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Solution

The fourth proportional to 86,984.70, 130,116.60 and 81,671.10 is: 122,168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,984.70 : 130,116.60 = 81,671.10 : x
  2. Step 2: Convert to fraction form
    86,984.70/130,116.60 = 81,671.10/x
  3. Step 3: Cross multiply
    86,984.70x = 130,116.60 × 81,671.10
  4. Step 4: Simplify right side
    86,984.70x = 10,626,765,850.26
  5. Step 5: Solve for x
    x = 10,626,765,850.26/86,984.70
  6. Step 6: Final answer
    x = 122,168.22

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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.