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Finding the Fourth Proportional to 68,342.40, 102,513.60 and 31,478.40

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Solution

The fourth proportional to 68,342.40, 102,513.60 and 31,478.40 is: 47,217.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,342.40 : 102,513.60 = 31,478.40 : x
  2. Step 2: Convert to fraction form
    68,342.40/102,513.60 = 31,478.40/x
  3. Step 3: Cross multiply
    68,342.40x = 102,513.60 × 31,478.40
  4. Step 4: Simplify right side
    68,342.40x = 3,226,964,106.24
  5. Step 5: Solve for x
    x = 3,226,964,106.24/68,342.40
  6. Step 6: Final answer
    x = 47,217.60

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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.