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Finding the Fourth Proportional to 1,380.63, 2,071.76 and 515.01

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Solution

The fourth proportional to 1,380.63, 2,071.76 and 515.01 is: 772.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.63 : 2,071.76 = 515.01 : x
  2. Step 2: Convert to fraction form
    1,380.63/2,071.76 = 515.01/x
  3. Step 3: Cross multiply
    1,380.63x = 2,071.76 × 515.01
  4. Step 4: Simplify right side
    1,380.63x = 1,066,974.54
  5. Step 5: Solve for x
    x = 1,066,974.54/1,380.63
  6. Step 6: Final answer
    x = 772.82

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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.