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Finding the Fourth Proportional to 1,209.98, 1,669.29 and 790.19

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Solution

The fourth proportional to 1,209.98, 1,669.29 and 790.19 is: 1,090.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.98 : 1,669.29 = 790.19 : x
  2. Step 2: Convert to fraction form
    1,209.98/1,669.29 = 790.19/x
  3. Step 3: Cross multiply
    1,209.98x = 1,669.29 × 790.19
  4. Step 4: Simplify right side
    1,209.98x = 1,319,056.27
  5. Step 5: Solve for x
    x = 1,319,056.27/1,209.98
  6. Step 6: Final answer
    x = 1,090.15

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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.