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Finding the Fourth Proportional to 70,621.31, 97,313.73 and 65,638.60

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Solution

The fourth proportional to 70,621.31, 97,313.73 and 65,638.60 is: 90,447.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,621.31 : 97,313.73 = 65,638.60 : x
  2. Step 2: Convert to fraction form
    70,621.31/97,313.73 = 65,638.60/x
  3. Step 3: Cross multiply
    70,621.31x = 97,313.73 × 65,638.60
  4. Step 4: Simplify right side
    70,621.31x = 6,387,536,997.98
  5. Step 5: Solve for x
    x = 6,387,536,997.98/70,621.31
  6. Step 6: Final answer
    x = 90,447.73

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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.