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Finding the Fourth Proportional to 128,915.87, 177,914.61 and 71,560.58

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Solution

The fourth proportional to 128,915.87, 177,914.61 and 71,560.58 is: 98,759.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,915.87 : 177,914.61 = 71,560.58 : x
  2. Step 2: Convert to fraction form
    128,915.87/177,914.61 = 71,560.58/x
  3. Step 3: Cross multiply
    128,915.87x = 177,914.61 × 71,560.58
  4. Step 4: Simplify right side
    128,915.87x = 12,731,671,792.50
  5. Step 5: Solve for x
    x = 12,731,671,792.50/128,915.87
  6. Step 6: Final answer
    x = 98,759.54

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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.