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Finding the Fourth Proportional to 70,906.77, 106,359.85 and 20,987.08

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Solution

The fourth proportional to 70,906.77, 106,359.85 and 20,987.08 is: 31,480.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,906.77 : 106,359.85 = 20,987.08 : x
  2. Step 2: Convert to fraction form
    70,906.77/106,359.85 = 20,987.08/x
  3. Step 3: Cross multiply
    70,906.77x = 106,359.85 × 20,987.08
  4. Step 4: Simplify right side
    70,906.77x = 2,232,182,044.00
  5. Step 5: Solve for x
    x = 2,232,182,044.00/70,906.77
  6. Step 6: Final answer
    x = 31,480.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.