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Finding the Fourth Proportional to 82,390.40, 123,634.20 and 54,391.40

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Solution

The fourth proportional to 82,390.40, 123,634.20 and 54,391.40 is: 81,619.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,390.40 : 123,634.20 = 54,391.40 : x
  2. Step 2: Convert to fraction form
    82,390.40/123,634.20 = 54,391.40/x
  3. Step 3: Cross multiply
    82,390.40x = 123,634.20 × 54,391.40
  4. Step 4: Simplify right side
    82,390.40x = 6,724,637,225.88
  5. Step 5: Solve for x
    x = 6,724,637,225.88/82,390.40
  6. Step 6: Final answer
    x = 81,619.18

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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.