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Finding the Fourth Proportional to 81,147.60, 121,692.60 and 56,187.60

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Solution

The fourth proportional to 81,147.60, 121,692.60 and 56,187.60 is: 84,261.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,147.60 : 121,692.60 = 56,187.60 : x
  2. Step 2: Convert to fraction form
    81,147.60/121,692.60 = 56,187.60/x
  3. Step 3: Cross multiply
    81,147.60x = 121,692.60 × 56,187.60
  4. Step 4: Simplify right side
    81,147.60x = 6,837,615,131.76
  5. Step 5: Solve for x
    x = 6,837,615,131.76/81,147.60
  6. Step 6: Final answer
    x = 84,261.46

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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.