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Finding the Fourth Proportional to 92,991.40, 128,326.62 and 50,551

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Solution

The fourth proportional to 92,991.40, 128,326.62 and 50,551 is: 69,759.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,991.40 : 128,326.62 = 50,551 : x
  2. Step 2: Convert to fraction form
    92,991.40/128,326.62 = 50,551/x
  3. Step 3: Cross multiply
    92,991.40x = 128,326.62 × 50,551
  4. Step 4: Simplify right side
    92,991.40x = 6,487,038,967.62
  5. Step 5: Solve for x
    x = 6,487,038,967.62/92,991.40
  6. Step 6: Final answer
    x = 69,759.56

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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.