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Finding the Fourth Proportional to 68,458.40, 102,687.60 and 19,210.40

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Solution

The fourth proportional to 68,458.40, 102,687.60 and 19,210.40 is: 28,815.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,458.40 : 102,687.60 = 19,210.40 : x
  2. Step 2: Convert to fraction form
    68,458.40/102,687.60 = 19,210.40/x
  3. Step 3: Cross multiply
    68,458.40x = 102,687.60 × 19,210.40
  4. Step 4: Simplify right side
    68,458.40x = 1,972,669,871.04
  5. Step 5: Solve for x
    x = 1,972,669,871.04/68,458.40
  6. Step 6: Final answer
    x = 28,815.60

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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.