Home / 128,787.18-177,709.38-71,425.82

Finding the Fourth Proportional to 128,787.18, 177,709.38 and 71,425.82

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Solution

The fourth proportional to 128,787.18, 177,709.38 and 71,425.82 is: 98,558.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,787.18 : 177,709.38 = 71,425.82 : x
  2. Step 2: Convert to fraction form
    128,787.18/177,709.38 = 71,425.82/x
  3. Step 3: Cross multiply
    128,787.18x = 177,709.38 × 71,425.82
  4. Step 4: Simplify right side
    128,787.18x = 12,693,037,299.64
  5. Step 5: Solve for x
    x = 12,693,037,299.64/128,787.18
  6. Step 6: Final answer
    x = 98,558.24

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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.