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Finding the Fourth Proportional to 128,578.95, 177,459.98 and 76,892.67

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Solution

The fourth proportional to 128,578.95, 177,459.98 and 76,892.67 is: 106,124.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,578.95 : 177,459.98 = 76,892.67 : x
  2. Step 2: Convert to fraction form
    128,578.95/177,459.98 = 76,892.67/x
  3. Step 3: Cross multiply
    128,578.95x = 177,459.98 × 76,892.67
  4. Step 4: Simplify right side
    128,578.95x = 13,645,371,295.88
  5. Step 5: Solve for x
    x = 13,645,371,295.88/128,578.95
  6. Step 6: Final answer
    x = 106,124.46

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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.