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Finding the Fourth Proportional to 1,536.79, 2,120.79 and 838.21

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Solution

The fourth proportional to 1,536.79, 2,120.79 and 838.21 is: 1,156.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,536.79 : 2,120.79 = 838.21 : x
  2. Step 2: Convert to fraction form
    1,536.79/2,120.79 = 838.21/x
  3. Step 3: Cross multiply
    1,536.79x = 2,120.79 × 838.21
  4. Step 4: Simplify right side
    1,536.79x = 1,777,667.39
  5. Step 5: Solve for x
    x = 1,777,667.39/1,536.79
  6. Step 6: Final answer
    x = 1,156.74

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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.