Home / 128,427.68-177,209.48-80,647.20

Finding the Fourth Proportional to 128,427.68, 177,209.48 and 80,647.20

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Solution

The fourth proportional to 128,427.68, 177,209.48 and 80,647.20 is: 111,280.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,427.68 : 177,209.48 = 80,647.20 : x
  2. Step 2: Convert to fraction form
    128,427.68/177,209.48 = 80,647.20/x
  3. Step 3: Cross multiply
    128,427.68x = 177,209.48 × 80,647.20
  4. Step 4: Simplify right side
    128,427.68x = 14,291,447,972.22
  5. Step 5: Solve for x
    x = 14,291,447,972.22/128,427.68
  6. Step 6: Final answer
    x = 111,280.13

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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.