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Finding the Fourth Proportional to 68,456.40, 102,684.60 and 42,212.40

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Solution

The fourth proportional to 68,456.40, 102,684.60 and 42,212.40 is: 63,318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,456.40 : 102,684.60 = 42,212.40 : x
  2. Step 2: Convert to fraction form
    68,456.40/102,684.60 = 42,212.40/x
  3. Step 3: Cross multiply
    68,456.40x = 102,684.60 × 42,212.40
  4. Step 4: Simplify right side
    68,456.40x = 4,334,563,409.04
  5. Step 5: Solve for x
    x = 4,334,563,409.04/68,456.40
  6. Step 6: Final answer
    x = 63,318.60

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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.