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Finding the Fourth Proportional to 70,991.28, 97,985.04 and 42,691.50

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Solution

The fourth proportional to 70,991.28, 97,985.04 and 42,691.50 is: 58,924.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,991.28 : 97,985.04 = 42,691.50 : x
  2. Step 2: Convert to fraction form
    70,991.28/97,985.04 = 42,691.50/x
  3. Step 3: Cross multiply
    70,991.28x = 97,985.04 × 42,691.50
  4. Step 4: Simplify right side
    70,991.28x = 4,183,128,335.16
  5. Step 5: Solve for x
    x = 4,183,128,335.16/70,991.28
  6. Step 6: Final answer
    x = 58,924.54

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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.