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Finding the Fourth Proportional to 102,705.20, 154,057.80 and 74,492.90

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Solution

The fourth proportional to 102,705.20, 154,057.80 and 74,492.90 is: 111,739.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,705.20 : 154,057.80 = 74,492.90 : x
  2. Step 2: Convert to fraction form
    102,705.20/154,057.80 = 74,492.90/x
  3. Step 3: Cross multiply
    102,705.20x = 154,057.80 × 74,492.90
  4. Step 4: Simplify right side
    102,705.20x = 11,476,212,289.62
  5. Step 5: Solve for x
    x = 11,476,212,289.62/102,705.20
  6. Step 6: Final answer
    x = 111,739.35

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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.