Home / 128,719.22-177,637.35-72,128.50

Finding the Fourth Proportional to 128,719.22, 177,637.35 and 72,128.50

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Solution

The fourth proportional to 128,719.22, 177,637.35 and 72,128.50 is: 99,540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719.22 : 177,637.35 = 72,128.50 : x
  2. Step 2: Convert to fraction form
    128,719.22/177,637.35 = 72,128.50/x
  3. Step 3: Cross multiply
    128,719.22x = 177,637.35 × 72,128.50
  4. Step 4: Simplify right side
    128,719.22x = 12,812,715,599.48
  5. Step 5: Solve for x
    x = 12,812,715,599.48/128,719.22
  6. Step 6: Final answer
    x = 99,540.03

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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.