Home / 5,120.72-7,681.98-2,118.75

Finding the Fourth Proportional to 5,120.72, 7,681.98 and 2,118.75

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Solution

The fourth proportional to 5,120.72, 7,681.98 and 2,118.75 is: 3,178.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.72 : 7,681.98 = 2,118.75 : x
  2. Step 2: Convert to fraction form
    5,120.72/7,681.98 = 2,118.75/x
  3. Step 3: Cross multiply
    5,120.72x = 7,681.98 × 2,118.75
  4. Step 4: Simplify right side
    5,120.72x = 16,276,195.13
  5. Step 5: Solve for x
    x = 16,276,195.13/5,120.72
  6. Step 6: Final answer
    x = 3,178.50

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Double scale
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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.