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Finding the Fourth Proportional to 128,745.61, 177,687.26 and 71,397.69

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Solution

The fourth proportional to 128,745.61, 177,687.26 and 71,397.69 is: 98,538.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,745.61 : 177,687.26 = 71,397.69 : x
  2. Step 2: Convert to fraction form
    128,745.61/177,687.26 = 71,397.69/x
  3. Step 3: Cross multiply
    128,745.61x = 177,687.26 × 71,397.69
  4. Step 4: Simplify right side
    128,745.61x = 12,686,459,800.07
  5. Step 5: Solve for x
    x = 12,686,459,800.07/128,745.61
  6. Step 6: Final answer
    x = 98,538.97

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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.