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Finding the Fourth Proportional to 91,958.63, 137,133.21 and 91,117.83

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Solution

The fourth proportional to 91,958.63, 137,133.21 and 91,117.83 is: 135,879.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,958.63 : 137,133.21 = 91,117.83 : x
  2. Step 2: Convert to fraction form
    91,958.63/137,133.21 = 91,117.83/x
  3. Step 3: Cross multiply
    91,958.63x = 137,133.21 × 91,117.83
  4. Step 4: Simplify right side
    91,958.63x = 12,495,280,516.13
  5. Step 5: Solve for x
    x = 12,495,280,516.13/91,958.63
  6. Step 6: Final answer
    x = 135,879.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.