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Finding the Fourth Proportional to 40,643.70, 60,916.95 and 20,912.10

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Solution

The fourth proportional to 40,643.70, 60,916.95 and 20,912.10 is: 31,343.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,643.70 : 60,916.95 = 20,912.10 : x
  2. Step 2: Convert to fraction form
    40,643.70/60,916.95 = 20,912.10/x
  3. Step 3: Cross multiply
    40,643.70x = 60,916.95 × 20,912.10
  4. Step 4: Simplify right side
    40,643.70x = 1,273,901,350.10
  5. Step 5: Solve for x
    x = 1,273,901,350.10/40,643.70
  6. Step 6: Final answer
    x = 31,343.14

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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.