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Finding the Fourth Proportional to 128,584.88, 177,431.16 and 71,987.12

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Solution

The fourth proportional to 128,584.88, 177,431.16 and 71,987.12 is: 99,333.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,584.88 : 177,431.16 = 71,987.12 : x
  2. Step 2: Convert to fraction form
    128,584.88/177,431.16 = 71,987.12/x
  3. Step 3: Cross multiply
    128,584.88x = 177,431.16 × 71,987.12
  4. Step 4: Simplify right side
    128,584.88x = 12,772,758,206.66
  5. Step 5: Solve for x
    x = 12,772,758,206.66/128,584.88
  6. Step 6: Final answer
    x = 99,333.28

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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.