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Finding the Fourth Proportional to 128,514.81, 177,329.28 and 80,734.32

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Solution

The fourth proportional to 128,514.81, 177,329.28 and 80,734.32 is: 111,400.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,514.81 : 177,329.28 = 80,734.32 : x
  2. Step 2: Convert to fraction form
    128,514.81/177,329.28 = 80,734.32/x
  3. Step 3: Cross multiply
    128,514.81x = 177,329.28 × 80,734.32
  4. Step 4: Simplify right side
    128,514.81x = 14,316,558,836.89
  5. Step 5: Solve for x
    x = 14,316,558,836.89/128,514.81
  6. Step 6: Final answer
    x = 111,400.07

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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.