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Finding the Fourth Proportional to 77,078.90, 115,626.04 and 20,919.91

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Solution

The fourth proportional to 77,078.90, 115,626.04 and 20,919.91 is: 31,381.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,078.90 : 115,626.04 = 20,919.91 : x
  2. Step 2: Convert to fraction form
    77,078.90/115,626.04 = 20,919.91/x
  3. Step 3: Cross multiply
    77,078.90x = 115,626.04 × 20,919.91
  4. Step 4: Simplify right side
    77,078.90x = 2,418,886,009.09
  5. Step 5: Solve for x
    x = 2,418,886,009.09/77,078.90
  6. Step 6: Final answer
    x = 31,381.95

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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.