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Finding the Fourth Proportional to 68,387.20, 102,590.40 and 21,635.20

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Solution

The fourth proportional to 68,387.20, 102,590.40 and 21,635.20 is: 32,455.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,387.20 : 102,590.40 = 21,635.20 : x
  2. Step 2: Convert to fraction form
    68,387.20/102,590.40 = 21,635.20/x
  3. Step 3: Cross multiply
    68,387.20x = 102,590.40 × 21,635.20
  4. Step 4: Simplify right side
    68,387.20x = 2,219,563,822.08
  5. Step 5: Solve for x
    x = 2,219,563,822.08/68,387.20
  6. Step 6: Final answer
    x = 32,455.84

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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.