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Finding the Fourth Proportional to 128,707.67, 177,616.64 and 78,406.67

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Solution

The fourth proportional to 128,707.67, 177,616.64 and 78,406.67 is: 108,201.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,707.67 : 177,616.64 = 78,406.67 : x
  2. Step 2: Convert to fraction form
    128,707.67/177,616.64 = 78,406.67/x
  3. Step 3: Cross multiply
    128,707.67x = 177,616.64 × 78,406.67
  4. Step 4: Simplify right side
    128,707.67x = 13,926,329,278.99
  5. Step 5: Solve for x
    x = 13,926,329,278.99/128,707.67
  6. Step 6: Final answer
    x = 108,201.24

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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.