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Finding the Fourth Proportional to 210,079.72, 289,858.26 and 128,387.08

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Solution

The fourth proportional to 210,079.72, 289,858.26 and 128,387.08 is: 177,142.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,079.72 : 289,858.26 = 128,387.08 : x
  2. Step 2: Convert to fraction form
    210,079.72/289,858.26 = 128,387.08/x
  3. Step 3: Cross multiply
    210,079.72x = 289,858.26 × 128,387.08
  4. Step 4: Simplify right side
    210,079.72x = 37,214,055,615.28
  5. Step 5: Solve for x
    x = 37,214,055,615.28/210,079.72
  6. Step 6: Final answer
    x = 177,142.54

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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.