Home / 128,968.88-177,984.95-72,380.25

Finding the Fourth Proportional to 128,968.88, 177,984.95 and 72,380.25

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Solution

The fourth proportional to 128,968.88, 177,984.95 and 72,380.25 is: 99,889.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,968.88 : 177,984.95 = 72,380.25 : x
  2. Step 2: Convert to fraction form
    128,968.88/177,984.95 = 72,380.25/x
  3. Step 3: Cross multiply
    128,968.88x = 177,984.95 × 72,380.25
  4. Step 4: Simplify right side
    128,968.88x = 12,882,594,815.34
  5. Step 5: Solve for x
    x = 12,882,594,815.34/128,968.88
  6. Step 6: Final answer
    x = 99,889.18

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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.