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Finding the Fourth Proportional to 68,386.40, 102,579.60 and 19,138.40

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Solution

The fourth proportional to 68,386.40, 102,579.60 and 19,138.40 is: 28,707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,386.40 : 102,579.60 = 19,138.40 : x
  2. Step 2: Convert to fraction form
    68,386.40/102,579.60 = 19,138.40/x
  3. Step 3: Cross multiply
    68,386.40x = 102,579.60 × 19,138.40
  4. Step 4: Simplify right side
    68,386.40x = 1,963,209,416.64
  5. Step 5: Solve for x
    x = 1,963,209,416.64/68,386.40
  6. Step 6: Final answer
    x = 28,707.60

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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.