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Finding the Fourth Proportional to 128,762.40, 193,604.40 and 108,487.20

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Solution

The fourth proportional to 128,762.40, 193,604.40 and 108,487.20 is: 163,119.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,762.40 : 193,604.40 = 108,487.20 : x
  2. Step 2: Convert to fraction form
    128,762.40/193,604.40 = 108,487.20/x
  3. Step 3: Cross multiply
    128,762.40x = 193,604.40 × 108,487.20
  4. Step 4: Simplify right side
    128,762.40x = 21,003,599,263.68
  5. Step 5: Solve for x
    x = 21,003,599,263.68/128,762.40
  6. Step 6: Final answer
    x = 163,119.04

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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.