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Finding the Fourth Proportional to 128,280.78, 177,076.80 and 114,828.30

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Solution

The fourth proportional to 128,280.78, 177,076.80 and 114,828.30 is: 158,507.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,280.78 : 177,076.80 = 114,828.30 : x
  2. Step 2: Convert to fraction form
    128,280.78/177,076.80 = 114,828.30/x
  3. Step 3: Cross multiply
    128,280.78x = 177,076.80 × 114,828.30
  4. Step 4: Simplify right side
    128,280.78x = 20,333,427,913.44
  5. Step 5: Solve for x
    x = 20,333,427,913.44/128,280.78
  6. Step 6: Final answer
    x = 158,507.21

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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.