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Finding the Fourth Proportional to 128,702.67, 177,609.74 and 78,401.67

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Solution

The fourth proportional to 128,702.67, 177,609.74 and 78,401.67 is: 108,194.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,702.67 : 177,609.74 = 78,401.67 : x
  2. Step 2: Convert to fraction form
    128,702.67/177,609.74 = 78,401.67/x
  3. Step 3: Cross multiply
    128,702.67x = 177,609.74 × 78,401.67
  4. Step 4: Simplify right side
    128,702.67x = 13,924,900,385.78
  5. Step 5: Solve for x
    x = 13,924,900,385.78/128,702.67
  6. Step 6: Final answer
    x = 108,194.34

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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.