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Finding the Fourth Proportional to 1,209.92, 1,669.98 and 790.78

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Solution

The fourth proportional to 1,209.92, 1,669.98 and 790.78 is: 1,091.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.92 : 1,669.98 = 790.78 : x
  2. Step 2: Convert to fraction form
    1,209.92/1,669.98 = 790.78/x
  3. Step 3: Cross multiply
    1,209.92x = 1,669.98 × 790.78
  4. Step 4: Simplify right side
    1,209.92x = 1,320,586.78
  5. Step 5: Solve for x
    x = 1,320,586.78/1,209.92
  6. Step 6: Final answer
    x = 1,091.47

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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.