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Finding the Fourth Proportional to 68,752.60, 103,128.90 and 51,256.60

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Solution

The fourth proportional to 68,752.60, 103,128.90 and 51,256.60 is: 76,884.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,752.60 : 103,128.90 = 51,256.60 : x
  2. Step 2: Convert to fraction form
    68,752.60/103,128.90 = 51,256.60/x
  3. Step 3: Cross multiply
    68,752.60x = 103,128.90 × 51,256.60
  4. Step 4: Simplify right side
    68,752.60x = 5,286,036,775.74
  5. Step 5: Solve for x
    x = 5,286,036,775.74/68,752.60
  6. Step 6: Final answer
    x = 76,884.90

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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.