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Finding the Fourth Proportional to 128,692.40, 193,009.80 and 84,628.40

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Solution

The fourth proportional to 128,692.40, 193,009.80 and 84,628.40 is: 126,923.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,692.40 : 193,009.80 = 84,628.40 : x
  2. Step 2: Convert to fraction form
    128,692.40/193,009.80 = 84,628.40/x
  3. Step 3: Cross multiply
    128,692.40x = 193,009.80 × 84,628.40
  4. Step 4: Simplify right side
    128,692.40x = 16,334,110,558.32
  5. Step 5: Solve for x
    x = 16,334,110,558.32/128,692.40
  6. Step 6: Final answer
    x = 126,923.66

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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.