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Finding the Fourth Proportional to 78,449.79, 108,261.44 and 42,639.89

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Solution

The fourth proportional to 78,449.79, 108,261.44 and 42,639.89 is: 58,843.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,449.79 : 108,261.44 = 42,639.89 : x
  2. Step 2: Convert to fraction form
    78,449.79/108,261.44 = 42,639.89/x
  3. Step 3: Cross multiply
    78,449.79x = 108,261.44 × 42,639.89
  4. Step 4: Simplify right side
    78,449.79x = 4,616,255,138.33
  5. Step 5: Solve for x
    x = 4,616,255,138.33/78,449.79
  6. Step 6: Final answer
    x = 58,843.44

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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.