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Finding the Fourth Proportional to 102,989.60, 154,354.80 and 91,325.60

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Solution

The fourth proportional to 102,989.60, 154,354.80 and 91,325.60 is: 136,873.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,989.60 : 154,354.80 = 91,325.60 : x
  2. Step 2: Convert to fraction form
    102,989.60/154,354.80 = 91,325.60/x
  3. Step 3: Cross multiply
    102,989.60x = 154,354.80 × 91,325.60
  4. Step 4: Simplify right side
    102,989.60x = 14,096,544,722.88
  5. Step 5: Solve for x
    x = 14,096,544,722.88/102,989.60
  6. Step 6: Final answer
    x = 136,873.48

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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.