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Finding the Fourth Proportional to 98,672.80, 147,620.40 and 85,669.60

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Solution

The fourth proportional to 98,672.80, 147,620.40 and 85,669.60 is: 128,166.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,672.80 : 147,620.40 = 85,669.60 : x
  2. Step 2: Convert to fraction form
    98,672.80/147,620.40 = 85,669.60/x
  3. Step 3: Cross multiply
    98,672.80x = 147,620.40 × 85,669.60
  4. Step 4: Simplify right side
    98,672.80x = 12,646,580,619.84
  5. Step 5: Solve for x
    x = 12,646,580,619.84/98,672.80
  6. Step 6: Final answer
    x = 128,166.84

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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.