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Finding the Fourth Proportional to 7,120.68, 10,681.80 and 2,961.18

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Solution

The fourth proportional to 7,120.68, 10,681.80 and 2,961.18 is: 4,442.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.68 : 10,681.80 = 2,961.18 : x
  2. Step 2: Convert to fraction form
    7,120.68/10,681.80 = 2,961.18/x
  3. Step 3: Cross multiply
    7,120.68x = 10,681.80 × 2,961.18
  4. Step 4: Simplify right side
    7,120.68x = 31,630,732.52
  5. Step 5: Solve for x
    x = 31,630,732.52/7,120.68
  6. Step 6: Final answer
    x = 4,442.09

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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.