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Finding the Fourth Proportional to 98,623.80, 147,935.70 and 81,343.80

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Solution

The fourth proportional to 98,623.80, 147,935.70 and 81,343.80 is: 122,015.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,623.80 : 147,935.70 = 81,343.80 : x
  2. Step 2: Convert to fraction form
    98,623.80/147,935.70 = 81,343.80/x
  3. Step 3: Cross multiply
    98,623.80x = 147,935.70 × 81,343.80
  4. Step 4: Simplify right side
    98,623.80x = 12,033,651,993.66
  5. Step 5: Solve for x
    x = 12,033,651,993.66/98,623.80
  6. Step 6: Final answer
    x = 122,015.70

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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.