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Finding the Fourth Proportional to 77,938.43, 107,555.01 and 42,128.42

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Solution

The fourth proportional to 77,938.43, 107,555.01 and 42,128.42 is: 58,137.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,938.43 : 107,555.01 = 42,128.42 : x
  2. Step 2: Convert to fraction form
    77,938.43/107,555.01 = 42,128.42/x
  3. Step 3: Cross multiply
    77,938.43x = 107,555.01 × 42,128.42
  4. Step 4: Simplify right side
    77,938.43x = 4,531,122,634.38
  5. Step 5: Solve for x
    x = 4,531,122,634.38/77,938.43
  6. Step 6: Final answer
    x = 58,137.21

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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.