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Finding the Fourth Proportional to 1,212.08, 1,672.08 and 838.40

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Solution

The fourth proportional to 1,212.08, 1,672.08 and 838.40 is: 1,156.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.08 : 1,672.08 = 838.40 : x
  2. Step 2: Convert to fraction form
    1,212.08/1,672.08 = 838.40/x
  3. Step 3: Cross multiply
    1,212.08x = 1,672.08 × 838.40
  4. Step 4: Simplify right side
    1,212.08x = 1,401,871.87
  5. Step 5: Solve for x
    x = 1,401,871.87/1,212.08
  6. Step 6: Final answer
    x = 1,156.58

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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.