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Finding the Fourth Proportional to 128,590.90, 177,290.96 and 88,234.60

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Solution

The fourth proportional to 128,590.90, 177,290.96 and 88,234.60 is: 121,650.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590.90 : 177,290.96 = 88,234.60 : x
  2. Step 2: Convert to fraction form
    128,590.90/177,290.96 = 88,234.60/x
  3. Step 3: Cross multiply
    128,590.90x = 177,290.96 × 88,234.60
  4. Step 4: Simplify right side
    128,590.90x = 15,643,196,939.22
  5. Step 5: Solve for x
    x = 15,643,196,939.22/128,590.90
  6. Step 6: Final answer
    x = 121,650.89

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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.