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Finding the Fourth Proportional to 98,600.10, 147,900.15 and 81,978.90

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Solution

The fourth proportional to 98,600.10, 147,900.15 and 81,978.90 is: 122,968.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,600.10 : 147,900.15 = 81,978.90 : x
  2. Step 2: Convert to fraction form
    98,600.10/147,900.15 = 81,978.90/x
  3. Step 3: Cross multiply
    98,600.10x = 147,900.15 × 81,978.90
  4. Step 4: Simplify right side
    98,600.10x = 12,124,691,606.84
  5. Step 5: Solve for x
    x = 12,124,691,606.84/98,600.10
  6. Step 6: Final answer
    x = 122,968.35

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Similar ratio
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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.