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Finding the Fourth Proportional to 86,705.64, 119,618.37 and 68,728.50

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Solution

The fourth proportional to 86,705.64, 119,618.37 and 68,728.50 is: 94,817.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,705.64 : 119,618.37 = 68,728.50 : x
  2. Step 2: Convert to fraction form
    86,705.64/119,618.37 = 68,728.50/x
  3. Step 3: Cross multiply
    86,705.64x = 119,618.37 × 68,728.50
  4. Step 4: Simplify right side
    86,705.64x = 8,221,191,142.55
  5. Step 5: Solve for x
    x = 8,221,191,142.55/86,705.64
  6. Step 6: Final answer
    x = 94,817.26

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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.