Home / 128,916.87-177,915.99-71,561.58

Finding the Fourth Proportional to 128,916.87, 177,915.99 and 71,561.58

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Solution

The fourth proportional to 128,916.87, 177,915.99 and 71,561.58 is: 98,760.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,916.87 : 177,915.99 = 71,561.58 : x
  2. Step 2: Convert to fraction form
    128,916.87/177,915.99 = 71,561.58/x
  3. Step 3: Cross multiply
    128,916.87x = 177,915.99 × 71,561.58
  4. Step 4: Simplify right side
    128,916.87x = 12,731,949,351.66
  5. Step 5: Solve for x
    x = 12,731,949,351.66/128,916.87
  6. Step 6: Final answer
    x = 98,760.93

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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.