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Finding the Fourth Proportional to 66,220, 91,383.60 and 36,412

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Solution

The fourth proportional to 66,220, 91,383.60 and 36,412 is: 50,248.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,220 : 91,383.60 = 36,412 : x
  2. Step 2: Convert to fraction form
    66,220/91,383.60 = 36,412/x
  3. Step 3: Cross multiply
    66,220x = 91,383.60 × 36,412
  4. Step 4: Simplify right side
    66,220x = 3,327,459,643.20
  5. Step 5: Solve for x
    x = 3,327,459,643.20/66,220
  6. Step 6: Final answer
    x = 50,248.56

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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.