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Finding the Fourth Proportional to 68,709.20, 102,862.20 and 51,256.40

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Solution

The fourth proportional to 68,709.20, 102,862.20 and 51,256.40 is: 76,734.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,709.20 : 102,862.20 = 51,256.40 : x
  2. Step 2: Convert to fraction form
    68,709.20/102,862.20 = 51,256.40/x
  3. Step 3: Cross multiply
    68,709.20x = 102,862.20 × 51,256.40
  4. Step 4: Simplify right side
    68,709.20x = 5,272,346,068.08
  5. Step 5: Solve for x
    x = 5,272,346,068.08/68,709.20
  6. Step 6: Final answer
    x = 76,734.21

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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.