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Finding the Fourth Proportional to 98,504.60, 135,844.08 and 78,427.76

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Solution

The fourth proportional to 98,504.60, 135,844.08 and 78,427.76 is: 108,156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,504.60 : 135,844.08 = 78,427.76 : x
  2. Step 2: Convert to fraction form
    98,504.60/135,844.08 = 78,427.76/x
  3. Step 3: Cross multiply
    98,504.60x = 135,844.08 × 78,427.76
  4. Step 4: Simplify right side
    98,504.60x = 10,653,946,903.66
  5. Step 5: Solve for x
    x = 10,653,946,903.66/98,504.60
  6. Step 6: Final answer
    x = 108,156.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.