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Finding the Fourth Proportional to 78,957.21, 118,390.79 and 46,949.79

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Solution

The fourth proportional to 78,957.21, 118,390.79 and 46,949.79 is: 70,397.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,957.21 : 118,390.79 = 46,949.79 : x
  2. Step 2: Convert to fraction form
    78,957.21/118,390.79 = 46,949.79/x
  3. Step 3: Cross multiply
    78,957.21x = 118,390.79 × 46,949.79
  4. Step 4: Simplify right side
    78,957.21x = 5,558,422,728.43
  5. Step 5: Solve for x
    x = 5,558,422,728.43/78,957.21
  6. Step 6: Final answer
    x = 70,397.91

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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.