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Finding the Fourth Proportional to 128,866.19, 177,836.29 and 71,505.74

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Solution

The fourth proportional to 128,866.19, 177,836.29 and 71,505.74 is: 98,678.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,866.19 : 177,836.29 = 71,505.74 : x
  2. Step 2: Convert to fraction form
    128,866.19/177,836.29 = 71,505.74/x
  3. Step 3: Cross multiply
    128,866.19x = 177,836.29 × 71,505.74
  4. Step 4: Simplify right side
    128,866.19x = 12,716,315,183.02
  5. Step 5: Solve for x
    x = 12,716,315,183.02/128,866.19
  6. Step 6: Final answer
    x = 98,678.44

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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.