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Finding the Fourth Proportional to 128,445.56, 177,195.72 and 83,138.09

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Solution

The fourth proportional to 128,445.56, 177,195.72 and 83,138.09 is: 114,692.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,445.56 : 177,195.72 = 83,138.09 : x
  2. Step 2: Convert to fraction form
    128,445.56/177,195.72 = 83,138.09/x
  3. Step 3: Cross multiply
    128,445.56x = 177,195.72 × 83,138.09
  4. Step 4: Simplify right side
    128,445.56x = 14,731,712,831.00
  5. Step 5: Solve for x
    x = 14,731,712,831.00/128,445.56
  6. Step 6: Final answer
    x = 114,692.27

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1.5x scale

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.