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Finding the Fourth Proportional to 10,916.40, 16,381.80 and 3,990.90

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Solution

The fourth proportional to 10,916.40, 16,381.80 and 3,990.90 is: 5,988.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,916.40 : 16,381.80 = 3,990.90 : x
  2. Step 2: Convert to fraction form
    10,916.40/16,381.80 = 3,990.90/x
  3. Step 3: Cross multiply
    10,916.40x = 16,381.80 × 3,990.90
  4. Step 4: Simplify right side
    10,916.40x = 65,378,125.62
  5. Step 5: Solve for x
    x = 65,378,125.62/10,916.40
  6. Step 6: Final answer
    x = 5,988.98

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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.