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Finding the Fourth Proportional to 128,970.72, 178,059.60 and 88,669.44

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Solution

The fourth proportional to 128,970.72, 178,059.60 and 88,669.44 is: 122,418.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.72 : 178,059.60 = 88,669.44 : x
  2. Step 2: Convert to fraction form
    128,970.72/178,059.60 = 88,669.44/x
  3. Step 3: Cross multiply
    128,970.72x = 178,059.60 × 88,669.44
  4. Step 4: Simplify right side
    128,970.72x = 15,788,445,018.62
  5. Step 5: Solve for x
    x = 15,788,445,018.62/128,970.72
  6. Step 6: Final answer
    x = 122,418.83

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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.