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Finding the Fourth Proportional to 70,880.13, 106,340.95 and 20,961.52

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Solution

The fourth proportional to 70,880.13, 106,340.95 and 20,961.52 is: 31,448.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,880.13 : 106,340.95 = 20,961.52 : x
  2. Step 2: Convert to fraction form
    70,880.13/106,340.95 = 20,961.52/x
  3. Step 3: Cross multiply
    70,880.13x = 106,340.95 × 20,961.52
  4. Step 4: Simplify right side
    70,880.13x = 2,229,067,710.59
  5. Step 5: Solve for x
    x = 2,229,067,710.59/70,880.13
  6. Step 6: Final answer
    x = 31,448.41

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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.