Home / 10,920.79-16,378.35-3,127.78

Finding the Fourth Proportional to 10,920.79, 16,378.35 and 3,127.78

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Solution

The fourth proportional to 10,920.79, 16,378.35 and 3,127.78 is: 4,690.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.79 : 16,378.35 = 3,127.78 : x
  2. Step 2: Convert to fraction form
    10,920.79/16,378.35 = 3,127.78/x
  3. Step 3: Cross multiply
    10,920.79x = 16,378.35 × 3,127.78
  4. Step 4: Simplify right side
    10,920.79x = 51,227,875.56
  5. Step 5: Solve for x
    x = 51,227,875.56/10,920.79
  6. Step 6: Final answer
    x = 4,690.86

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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.