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Finding the Fourth Proportional to 99,561.80, 149,342.70 and 98,978.60

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Solution

The fourth proportional to 99,561.80, 149,342.70 and 98,978.60 is: 148,467.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,561.80 : 149,342.70 = 98,978.60 : x
  2. Step 2: Convert to fraction form
    99,561.80/149,342.70 = 98,978.60/x
  3. Step 3: Cross multiply
    99,561.80x = 149,342.70 × 98,978.60
  4. Step 4: Simplify right side
    99,561.80x = 14,781,731,366.22
  5. Step 5: Solve for x
    x = 14,781,731,366.22/99,561.80
  6. Step 6: Final answer
    x = 148,467.90

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1.5x scale

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.