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Finding the Fourth Proportional to 68,712.20, 103,100.70 and 51,216.20

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Solution

The fourth proportional to 68,712.20, 103,100.70 and 51,216.20 is: 76,848.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,712.20 : 103,100.70 = 51,216.20 : x
  2. Step 2: Convert to fraction form
    68,712.20/103,100.70 = 51,216.20/x
  3. Step 3: Cross multiply
    68,712.20x = 103,100.70 × 51,216.20
  4. Step 4: Simplify right side
    68,712.20x = 5,280,426,071.34
  5. Step 5: Solve for x
    x = 5,280,426,071.34/68,712.20
  6. Step 6: Final answer
    x = 76,848.45

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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.