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Finding the Fourth Proportional to 128,954.69, 177,970.25 and 72,366.29

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Solution

The fourth proportional to 128,954.69, 177,970.25 and 72,366.29 is: 99,872.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,954.69 : 177,970.25 = 72,366.29 : x
  2. Step 2: Convert to fraction form
    128,954.69/177,970.25 = 72,366.29/x
  3. Step 3: Cross multiply
    128,954.69x = 177,970.25 × 72,366.29
  4. Step 4: Simplify right side
    128,954.69x = 12,879,046,722.87
  5. Step 5: Solve for x
    x = 12,879,046,722.87/128,954.69
  6. Step 6: Final answer
    x = 99,872.65

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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.