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Finding the Fourth Proportional to 128,491.28, 177,369.48 and 84,877.52

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Solution

The fourth proportional to 128,491.28, 177,369.48 and 84,877.52 is: 117,165.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.28 : 177,369.48 = 84,877.52 : x
  2. Step 2: Convert to fraction form
    128,491.28/177,369.48 = 84,877.52/x
  3. Step 3: Cross multiply
    128,491.28x = 177,369.48 × 84,877.52
  4. Step 4: Simplify right side
    128,491.28x = 15,054,681,586.09
  5. Step 5: Solve for x
    x = 15,054,681,586.09/128,491.28
  6. Step 6: Final answer
    x = 117,165.01

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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.