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Finding the Fourth Proportional to 118,728.72, 163,859.76 and 71,007.84

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Solution

The fourth proportional to 118,728.72, 163,859.76 and 71,007.84 is: 97,999.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,728.72 : 163,859.76 = 71,007.84 : x
  2. Step 2: Convert to fraction form
    118,728.72/163,859.76 = 71,007.84/x
  3. Step 3: Cross multiply
    118,728.72x = 163,859.76 × 71,007.84
  4. Step 4: Simplify right side
    118,728.72x = 11,635,327,620.52
  5. Step 5: Solve for x
    x = 11,635,327,620.52/118,728.72
  6. Step 6: Final answer
    x = 97,999.27

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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.