Home / 128,427.18-177,208.79-80,646.69

Finding the Fourth Proportional to 128,427.18, 177,208.79 and 80,646.69

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Solution

The fourth proportional to 128,427.18, 177,208.79 and 80,646.69 is: 111,279.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,427.18 : 177,208.79 = 80,646.69 : x
  2. Step 2: Convert to fraction form
    128,427.18/177,208.79 = 80,646.69/x
  3. Step 3: Cross multiply
    128,427.18x = 177,208.79 × 80,646.69
  4. Step 4: Simplify right side
    128,427.18x = 14,291,302,352.41
  5. Step 5: Solve for x
    x = 14,291,302,352.41/128,427.18
  6. Step 6: Final answer
    x = 111,279.42

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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.