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Finding the Fourth Proportional to 10,916.70, 16,371.45 and 3,990.30

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Solution

The fourth proportional to 10,916.70, 16,371.45 and 3,990.30 is: 5,984.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,916.70 : 16,371.45 = 3,990.30 : x
  2. Step 2: Convert to fraction form
    10,916.70/16,371.45 = 3,990.30/x
  3. Step 3: Cross multiply
    10,916.70x = 16,371.45 × 3,990.30
  4. Step 4: Simplify right side
    10,916.70x = 65,326,996.94
  5. Step 5: Solve for x
    x = 65,326,996.94/10,916.70
  6. Step 6: Final answer
    x = 5,984.13

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1.5x scale

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.