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Finding the Fourth Proportional to 105,128.40, 157,692.60 and 81,627.60

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Solution

The fourth proportional to 105,128.40, 157,692.60 and 81,627.60 is: 122,441.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,128.40 : 157,692.60 = 81,627.60 : x
  2. Step 2: Convert to fraction form
    105,128.40/157,692.60 = 81,627.60/x
  3. Step 3: Cross multiply
    105,128.40x = 157,692.60 × 81,627.60
  4. Step 4: Simplify right side
    105,128.40x = 12,872,068,475.76
  5. Step 5: Solve for x
    x = 12,872,068,475.76/105,128.40
  6. Step 6: Final answer
    x = 122,441.40

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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.