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Finding the Fourth Proportional to 118,679.88, 163,956.12 and 77,940.81

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Solution

The fourth proportional to 118,679.88, 163,956.12 and 77,940.81 is: 107,675.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,679.88 : 163,956.12 = 77,940.81 : x
  2. Step 2: Convert to fraction form
    118,679.88/163,956.12 = 77,940.81/x
  3. Step 3: Cross multiply
    118,679.88x = 163,956.12 × 77,940.81
  4. Step 4: Simplify right side
    118,679.88x = 12,778,872,797.26
  5. Step 5: Solve for x
    x = 12,778,872,797.26/118,679.88
  6. Step 6: Final answer
    x = 107,675.14

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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.