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Finding the Fourth Proportional to 128,305.36, 177,061.62 and 71,716.69

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Solution

The fourth proportional to 128,305.36, 177,061.62 and 71,716.69 is: 98,969.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,305.36 : 177,061.62 = 71,716.69 : x
  2. Step 2: Convert to fraction form
    128,305.36/177,061.62 = 71,716.69/x
  3. Step 3: Cross multiply
    128,305.36x = 177,061.62 × 71,716.69
  4. Step 4: Simplify right side
    128,305.36x = 12,698,273,312.44
  5. Step 5: Solve for x
    x = 12,698,273,312.44/128,305.36
  6. Step 6: Final answer
    x = 98,969.16

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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.