Home / 7,115.12-9,819-4,131.20

Finding the Fourth Proportional to 7,115.12, 9,819 and 4,131.20

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Solution

The fourth proportional to 7,115.12, 9,819 and 4,131.20 is: 5,701.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.12 : 9,819 = 4,131.20 : x
  2. Step 2: Convert to fraction form
    7,115.12/9,819 = 4,131.20/x
  3. Step 3: Cross multiply
    7,115.12x = 9,819 × 4,131.20
  4. Step 4: Simplify right side
    7,115.12x = 40,564,252.80
  5. Step 5: Solve for x
    x = 40,564,252.80/7,115.12
  6. Step 6: Final answer
    x = 5,701.13

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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.