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Finding the Fourth Proportional to 70,921.37, 97,871.69 and 39,090.40

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Solution

The fourth proportional to 70,921.37, 97,871.69 and 39,090.40 is: 53,944.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,921.37 : 97,871.69 = 39,090.40 : x
  2. Step 2: Convert to fraction form
    70,921.37/97,871.69 = 39,090.40/x
  3. Step 3: Cross multiply
    70,921.37x = 97,871.69 × 39,090.40
  4. Step 4: Simplify right side
    70,921.37x = 3,825,843,363.82
  5. Step 5: Solve for x
    x = 3,825,843,363.82/70,921.37
  6. Step 6: Final answer
    x = 53,944.86

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1.5x scale

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.