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Finding the Fourth Proportional to 98,772.90, 147,940.65 and 81,276.90

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Solution

The fourth proportional to 98,772.90, 147,940.65 and 81,276.90 is: 121,735.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,772.90 : 147,940.65 = 81,276.90 : x
  2. Step 2: Convert to fraction form
    98,772.90/147,940.65 = 81,276.90/x
  3. Step 3: Cross multiply
    98,772.90x = 147,940.65 × 81,276.90
  4. Step 4: Simplify right side
    98,772.90x = 12,024,157,415.99
  5. Step 5: Solve for x
    x = 12,024,157,415.99/98,772.90
  6. Step 6: Final answer
    x = 121,735.39

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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.