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Finding the Fourth Proportional to 91,184.40, 136,661.40 and 81,277.20

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Solution

The fourth proportional to 91,184.40, 136,661.40 and 81,277.20 is: 121,813.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,184.40 : 136,661.40 = 81,277.20 : x
  2. Step 2: Convert to fraction form
    91,184.40/136,661.40 = 81,277.20/x
  3. Step 3: Cross multiply
    91,184.40x = 136,661.40 × 81,277.20
  4. Step 4: Simplify right side
    91,184.40x = 11,107,455,940.08
  5. Step 5: Solve for x
    x = 11,107,455,940.08/91,184.40
  6. Step 6: Final answer
    x = 121,813.12

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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.