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Finding the Fourth Proportional to 128,745.35, 177,686.96 and 71,397.42

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Solution

The fourth proportional to 128,745.35, 177,686.96 and 71,397.42 is: 98,538.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,745.35 : 177,686.96 = 71,397.42 : x
  2. Step 2: Convert to fraction form
    128,745.35/177,686.96 = 71,397.42/x
  3. Step 3: Cross multiply
    128,745.35x = 177,686.96 × 71,397.42
  4. Step 4: Simplify right side
    128,745.35x = 12,686,391,490.33
  5. Step 5: Solve for x
    x = 12,686,391,490.33/128,745.35
  6. Step 6: Final answer
    x = 98,538.64

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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.