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Finding the Fourth Proportional to 70,921.80, 97,871.60 and 39,090.72

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Solution

The fourth proportional to 70,921.80, 97,871.60 and 39,090.72 is: 53,944.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,921.80 : 97,871.60 = 39,090.72 : x
  2. Step 2: Convert to fraction form
    70,921.80/97,871.60 = 39,090.72/x
  3. Step 3: Cross multiply
    70,921.80x = 97,871.60 × 39,090.72
  4. Step 4: Simplify right side
    70,921.80x = 3,825,871,311.55
  5. Step 5: Solve for x
    x = 3,825,871,311.55/70,921.80
  6. Step 6: Final answer
    x = 53,944.93

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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.