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Finding the Fourth Proportional to 68,412.20, 102,618.30 and 65,787.80

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Solution

The fourth proportional to 68,412.20, 102,618.30 and 65,787.80 is: 98,681.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,412.20 : 102,618.30 = 65,787.80 : x
  2. Step 2: Convert to fraction form
    68,412.20/102,618.30 = 65,787.80/x
  3. Step 3: Cross multiply
    68,412.20x = 102,618.30 × 65,787.80
  4. Step 4: Simplify right side
    68,412.20x = 6,751,032,196.74
  5. Step 5: Solve for x
    x = 6,751,032,196.74/68,412.20
  6. Step 6: Final answer
    x = 98,681.70

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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.