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Finding the Fourth Proportional to 98,459.20, 147,687.70 and 66,790.80

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Solution

The fourth proportional to 98,459.20, 147,687.70 and 66,790.80 is: 100,185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,459.20 : 147,687.70 = 66,790.80 : x
  2. Step 2: Convert to fraction form
    98,459.20/147,687.70 = 66,790.80/x
  3. Step 3: Cross multiply
    98,459.20x = 147,687.70 × 66,790.80
  4. Step 4: Simplify right side
    98,459.20x = 9,864,179,633.16
  5. Step 5: Solve for x
    x = 9,864,179,633.16/98,459.20
  6. Step 6: Final answer
    x = 100,185.45

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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.