Home / 42,905.40-64,401.30-20,736.60

Finding the Fourth Proportional to 42,905.40, 64,401.30 and 20,736.60

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Solution

The fourth proportional to 42,905.40, 64,401.30 and 20,736.60 is: 31,125.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,905.40 : 64,401.30 = 20,736.60 : x
  2. Step 2: Convert to fraction form
    42,905.40/64,401.30 = 20,736.60/x
  3. Step 3: Cross multiply
    42,905.40x = 64,401.30 × 20,736.60
  4. Step 4: Simplify right side
    42,905.40x = 1,335,463,997.58
  5. Step 5: Solve for x
    x = 1,335,463,997.58/42,905.40
  6. Step 6: Final answer
    x = 31,125.78

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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.