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Finding the Fourth Proportional to 128,858.10, 177,830.17 and 80,488.67

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Solution

The fourth proportional to 128,858.10, 177,830.17 and 80,488.67 is: 111,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,858.10 : 177,830.17 = 80,488.67 : x
  2. Step 2: Convert to fraction form
    128,858.10/177,830.17 = 80,488.67/x
  3. Step 3: Cross multiply
    128,858.10x = 177,830.17 × 80,488.67
  4. Step 4: Simplify right side
    128,858.10x = 14,313,312,577.58
  5. Step 5: Solve for x
    x = 14,313,312,577.58/128,858.10
  6. Step 6: Final answer
    x = 111,078.10

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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.