Home / 128,916.88-177,915.99-71,561.59

Finding the Fourth Proportional to 128,916.88, 177,915.99 and 71,561.59

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Solution

The fourth proportional to 128,916.88, 177,915.99 and 71,561.59 is: 98,760.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,916.88 : 177,915.99 = 71,561.59 : x
  2. Step 2: Convert to fraction form
    128,916.88/177,915.99 = 71,561.59/x
  3. Step 3: Cross multiply
    128,916.88x = 177,915.99 × 71,561.59
  4. Step 4: Simplify right side
    128,916.88x = 12,731,951,130.82
  5. Step 5: Solve for x
    x = 12,731,951,130.82/128,916.88
  6. Step 6: Final answer
    x = 98,760.93

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1.5x scale

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.