Home / 7,116.12-9,820.78-3,930.02

Finding the Fourth Proportional to 7,116.12, 9,820.78 and 3,930.02

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Solution

The fourth proportional to 7,116.12, 9,820.78 and 3,930.02 is: 5,423.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,116.12 : 9,820.78 = 3,930.02 : x
  2. Step 2: Convert to fraction form
    7,116.12/9,820.78 = 3,930.02/x
  3. Step 3: Cross multiply
    7,116.12x = 9,820.78 × 3,930.02
  4. Step 4: Simplify right side
    7,116.12x = 38,595,861.82
  5. Step 5: Solve for x
    x = 38,595,861.82/7,116.12
  6. Step 6: Final answer
    x = 5,423.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.