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Finding the Fourth Proportional to 70,959.12, 97,921.35 and 39,129.36

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Solution

The fourth proportional to 70,959.12, 97,921.35 and 39,129.36 is: 53,997.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,959.12 : 97,921.35 = 39,129.36 : x
  2. Step 2: Convert to fraction form
    70,959.12/97,921.35 = 39,129.36/x
  3. Step 3: Cross multiply
    70,959.12x = 97,921.35 × 39,129.36
  4. Step 4: Simplify right side
    70,959.12x = 3,831,599,755.84
  5. Step 5: Solve for x
    x = 3,831,599,755.84/70,959.12
  6. Step 6: Final answer
    x = 53,997.28

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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.