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Finding the Fourth Proportional to 102,705.60, 154,058.40 and 72,638.40

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Solution

The fourth proportional to 102,705.60, 154,058.40 and 72,638.40 is: 108,957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,705.60 : 154,058.40 = 72,638.40 : x
  2. Step 2: Convert to fraction form
    102,705.60/154,058.40 = 72,638.40/x
  3. Step 3: Cross multiply
    102,705.60x = 154,058.40 × 72,638.40
  4. Step 4: Simplify right side
    102,705.60x = 11,190,555,682.56
  5. Step 5: Solve for x
    x = 11,190,555,682.56/102,705.60
  6. Step 6: Final answer
    x = 108,957.60

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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.