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Finding the Fourth Proportional to 128,623, 177,467.67 and 74,191.81

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Solution

The fourth proportional to 128,623, 177,467.67 and 74,191.81 is: 102,366.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,623 : 177,467.67 = 74,191.81 : x
  2. Step 2: Convert to fraction form
    128,623/177,467.67 = 74,191.81/x
  3. Step 3: Cross multiply
    128,623x = 177,467.67 × 74,191.81
  4. Step 4: Simplify right side
    128,623x = 13,166,647,653.78
  5. Step 5: Solve for x
    x = 13,166,647,653.78/128,623
  6. Step 6: Final answer
    x = 102,366.20

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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.