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Finding the Fourth Proportional to 112,908, 155,809.80 and 61,919.76

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Solution

The fourth proportional to 112,908, 155,809.80 and 61,919.76 is: 85,447.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,908 : 155,809.80 = 61,919.76 : x
  2. Step 2: Convert to fraction form
    112,908/155,809.80 = 61,919.76/x
  3. Step 3: Cross multiply
    112,908x = 155,809.80 × 61,919.76
  4. Step 4: Simplify right side
    112,908x = 9,647,705,421.65
  5. Step 5: Solve for x
    x = 9,647,705,421.65/112,908
  6. Step 6: Final answer
    x = 85,447.49

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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.