Home / 128,428.56-177,248.20-71,851.60

Finding the Fourth Proportional to 128,428.56, 177,248.20 and 71,851.60

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Solution

The fourth proportional to 128,428.56, 177,248.20 and 71,851.60 is: 99,164.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,428.56 : 177,248.20 = 71,851.60 : x
  2. Step 2: Convert to fraction form
    128,428.56/177,248.20 = 71,851.60/x
  3. Step 3: Cross multiply
    128,428.56x = 177,248.20 × 71,851.60
  4. Step 4: Simplify right side
    128,428.56x = 12,735,566,767.12
  5. Step 5: Solve for x
    x = 12,735,566,767.12/128,428.56
  6. Step 6: Final answer
    x = 99,164.60

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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.