Home / 128,428.83-177,231.95-71,070.54

Finding the Fourth Proportional to 128,428.83, 177,231.95 and 71,070.54

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Solution

The fourth proportional to 128,428.83, 177,231.95 and 71,070.54 is: 98,077.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,428.83 : 177,231.95 = 71,070.54 : x
  2. Step 2: Convert to fraction form
    128,428.83/177,231.95 = 71,070.54/x
  3. Step 3: Cross multiply
    128,428.83x = 177,231.95 × 71,070.54
  4. Step 4: Simplify right side
    128,428.83x = 12,595,970,036.40
  5. Step 5: Solve for x
    x = 12,595,970,036.40/128,428.83
  6. Step 6: Final answer
    x = 98,077.43

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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.