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Finding the Fourth Proportional to 68,538.20, 102,807.30 and 65,913.80

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Solution

The fourth proportional to 68,538.20, 102,807.30 and 65,913.80 is: 98,870.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,538.20 : 102,807.30 = 65,913.80 : x
  2. Step 2: Convert to fraction form
    68,538.20/102,807.30 = 65,913.80/x
  3. Step 3: Cross multiply
    68,538.20x = 102,807.30 × 65,913.80
  4. Step 4: Simplify right side
    68,538.20x = 6,776,419,810.74
  5. Step 5: Solve for x
    x = 6,776,419,810.74/68,538.20
  6. Step 6: Final answer
    x = 98,870.70

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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.