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Finding the Fourth Proportional to 78,797.65, 108,738.60 and 42,987.65

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Solution

The fourth proportional to 78,797.65, 108,738.60 and 42,987.65 is: 59,321.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,797.65 : 108,738.60 = 42,987.65 : x
  2. Step 2: Convert to fraction form
    78,797.65/108,738.60 = 42,987.65/x
  3. Step 3: Cross multiply
    78,797.65x = 108,738.60 × 42,987.65
  4. Step 4: Simplify right side
    78,797.65x = 4,674,416,878.29
  5. Step 5: Solve for x
    x = 4,674,416,878.29/78,797.65
  6. Step 6: Final answer
    x = 59,321.78

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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.