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Finding the Fourth Proportional to 1,212.16, 1,672.08 and 819.28

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Solution

The fourth proportional to 1,212.16, 1,672.08 and 819.28 is: 1,130.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.16 : 1,672.08 = 819.28 : x
  2. Step 2: Convert to fraction form
    1,212.16/1,672.08 = 819.28/x
  3. Step 3: Cross multiply
    1,212.16x = 1,672.08 × 819.28
  4. Step 4: Simplify right side
    1,212.16x = 1,369,901.70
  5. Step 5: Solve for x
    x = 1,369,901.70/1,212.16
  6. Step 6: Final answer
    x = 1,130.13

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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.