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Finding the Fourth Proportional to 92,991.31, 128,380.76 and 71,146.53

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Solution

The fourth proportional to 92,991.31, 128,380.76 and 71,146.53 is: 98,222.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,991.31 : 128,380.76 = 71,146.53 : x
  2. Step 2: Convert to fraction form
    92,991.31/128,380.76 = 71,146.53/x
  3. Step 3: Cross multiply
    92,991.31x = 128,380.76 × 71,146.53
  4. Step 4: Simplify right side
    92,991.31x = 9,133,845,592.76
  5. Step 5: Solve for x
    x = 9,133,845,592.76/92,991.31
  6. Step 6: Final answer
    x = 98,222.57

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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.