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Finding the Fourth Proportional to 128,588.51, 177,790.60 and 112,627.05

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Solution

The fourth proportional to 128,588.51, 177,790.60 and 112,627.05 is: 155,721.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,588.51 : 177,790.60 = 112,627.05 : x
  2. Step 2: Convert to fraction form
    128,588.51/177,790.60 = 112,627.05/x
  3. Step 3: Cross multiply
    128,588.51x = 177,790.60 × 112,627.05
  4. Step 4: Simplify right side
    128,588.51x = 20,024,030,514.16
  5. Step 5: Solve for x
    x = 20,024,030,514.16/128,588.51
  6. Step 6: Final answer
    x = 155,721.78

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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.