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Finding the Fourth Proportional to 68,460.40, 102,690.60 and 42,216.40

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Solution

The fourth proportional to 68,460.40, 102,690.60 and 42,216.40 is: 63,324.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,460.40 : 102,690.60 = 42,216.40 : x
  2. Step 2: Convert to fraction form
    68,460.40/102,690.60 = 42,216.40/x
  3. Step 3: Cross multiply
    68,460.40x = 102,690.60 × 42,216.40
  4. Step 4: Simplify right side
    68,460.40x = 4,335,227,445.84
  5. Step 5: Solve for x
    x = 4,335,227,445.84/68,460.40
  6. Step 6: Final answer
    x = 63,324.60

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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.