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Finding the Fourth Proportional to 128,845.45, 177,806.93 and 71,482.97

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Solution

The fourth proportional to 128,845.45, 177,806.93 and 71,482.97 is: 98,646.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,845.45 : 177,806.93 = 71,482.97 : x
  2. Step 2: Convert to fraction form
    128,845.45/177,806.93 = 71,482.97/x
  3. Step 3: Cross multiply
    128,845.45x = 177,806.93 × 71,482.97
  4. Step 4: Simplify right side
    128,845.45x = 12,710,167,442.98
  5. Step 5: Solve for x
    x = 12,710,167,442.98/128,845.45
  6. Step 6: Final answer
    x = 98,646.61

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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.