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Finding the Fourth Proportional to 98,420.80, 147,631.20 and 91,811.20

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Solution

The fourth proportional to 98,420.80, 147,631.20 and 91,811.20 is: 137,716.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,420.80 : 147,631.20 = 91,811.20 : x
  2. Step 2: Convert to fraction form
    98,420.80/147,631.20 = 91,811.20/x
  3. Step 3: Cross multiply
    98,420.80x = 147,631.20 × 91,811.20
  4. Step 4: Simplify right side
    98,420.80x = 13,554,197,629.44
  5. Step 5: Solve for x
    x = 13,554,197,629.44/98,420.80
  6. Step 6: Final answer
    x = 137,716.80

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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.