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Finding the Fourth Proportional to 91,205.31, 136,829.04 and 28,875.81

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Solution

The fourth proportional to 91,205.31, 136,829.04 and 28,875.81 is: 43,320.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,205.31 : 136,829.04 = 28,875.81 : x
  2. Step 2: Convert to fraction form
    91,205.31/136,829.04 = 28,875.81/x
  3. Step 3: Cross multiply
    91,205.31x = 136,829.04 × 28,875.81
  4. Step 4: Simplify right side
    91,205.31x = 3,951,049,361.52
  5. Step 5: Solve for x
    x = 3,951,049,361.52/91,205.31
  6. Step 6: Final answer
    x = 43,320.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.