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Finding the Fourth Proportional to 92,905.80, 139,358.70 and 64,912.20

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Solution

The fourth proportional to 92,905.80, 139,358.70 and 64,912.20 is: 97,368.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,905.80 : 139,358.70 = 64,912.20 : x
  2. Step 2: Convert to fraction form
    92,905.80/139,358.70 = 64,912.20/x
  3. Step 3: Cross multiply
    92,905.80x = 139,358.70 × 64,912.20
  4. Step 4: Simplify right side
    92,905.80x = 9,046,079,806.14
  5. Step 5: Solve for x
    x = 9,046,079,806.14/92,905.80
  6. Step 6: Final answer
    x = 97,368.30

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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.