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Finding the Fourth Proportional to 1,230.88, 1,698.96 and 1,212.16

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Solution

The fourth proportional to 1,230.88, 1,698.96 and 1,212.16 is: 1,673.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.88 : 1,698.96 = 1,212.16 : x
  2. Step 2: Convert to fraction form
    1,230.88/1,698.96 = 1,212.16/x
  3. Step 3: Cross multiply
    1,230.88x = 1,698.96 × 1,212.16
  4. Step 4: Simplify right side
    1,230.88x = 2,059,411.35
  5. Step 5: Solve for x
    x = 2,059,411.35/1,230.88
  6. Step 6: Final answer
    x = 1,673.12

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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.