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Finding the Fourth Proportional to 86,165.60, 128,956.80 and 86,165.60

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Solution

The fourth proportional to 86,165.60, 128,956.80 and 86,165.60 is: 128,956.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,165.60 : 128,956.80 = 86,165.60 : x
  2. Step 2: Convert to fraction form
    86,165.60/128,956.80 = 86,165.60/x
  3. Step 3: Cross multiply
    86,165.60x = 128,956.80 × 86,165.60
  4. Step 4: Simplify right side
    86,165.60x = 11,111,640,046.08
  5. Step 5: Solve for x
    x = 11,111,640,046.08/86,165.60
  6. Step 6: Final answer
    x = 128,956.80

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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.