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Finding the Fourth Proportional to 98,739.40, 147,890.40 and 81,243.40

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Solution

The fourth proportional to 98,739.40, 147,890.40 and 81,243.40 is: 121,685.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,739.40 : 147,890.40 = 81,243.40 : x
  2. Step 2: Convert to fraction form
    98,739.40/147,890.40 = 81,243.40/x
  3. Step 3: Cross multiply
    98,739.40x = 147,890.40 × 81,243.40
  4. Step 4: Simplify right side
    98,739.40x = 12,015,118,923.36
  5. Step 5: Solve for x
    x = 12,015,118,923.36/98,739.40
  6. Step 6: Final answer
    x = 121,685.15

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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.