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Finding the Fourth Proportional to 1,380.82, 2,071.16 and 515.06

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Solution

The fourth proportional to 1,380.82, 2,071.16 and 515.06 is: 772.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.82 : 2,071.16 = 515.06 : x
  2. Step 2: Convert to fraction form
    1,380.82/2,071.16 = 515.06/x
  3. Step 3: Cross multiply
    1,380.82x = 2,071.16 × 515.06
  4. Step 4: Simplify right side
    1,380.82x = 1,066,776.20
  5. Step 5: Solve for x
    x = 1,066,776.20/1,380.82
  6. Step 6: Final answer
    x = 772.57

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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.