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Finding the Fourth Proportional to 68,216.40, 102,478.20 and 65,605.20

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Solution

The fourth proportional to 68,216.40, 102,478.20 and 65,605.20 is: 98,555.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,216.40 : 102,478.20 = 65,605.20 : x
  2. Step 2: Convert to fraction form
    68,216.40/102,478.20 = 65,605.20/x
  3. Step 3: Cross multiply
    68,216.40x = 102,478.20 × 65,605.20
  4. Step 4: Simplify right side
    68,216.40x = 6,723,102,806.64
  5. Step 5: Solve for x
    x = 6,723,102,806.64/68,216.40
  6. Step 6: Final answer
    x = 98,555.52

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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.