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Finding the Fourth Proportional to 1,209.86, 1,669.03 and 790.28

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Solution

The fourth proportional to 1,209.86, 1,669.03 and 790.28 is: 1,090.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.86 : 1,669.03 = 790.28 : x
  2. Step 2: Convert to fraction form
    1,209.86/1,669.03 = 790.28/x
  3. Step 3: Cross multiply
    1,209.86x = 1,669.03 × 790.28
  4. Step 4: Simplify right side
    1,209.86x = 1,319,001.03
  5. Step 5: Solve for x
    x = 1,319,001.03/1,209.86
  6. Step 6: Final answer
    x = 1,090.21

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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.