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Finding the Fourth Proportional to 1,209.26, 1,670.02 and 988.94

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Solution

The fourth proportional to 1,209.26, 1,670.02 and 988.94 is: 1,365.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.26 : 1,670.02 = 988.94 : x
  2. Step 2: Convert to fraction form
    1,209.26/1,670.02 = 988.94/x
  3. Step 3: Cross multiply
    1,209.26x = 1,670.02 × 988.94
  4. Step 4: Simplify right side
    1,209.26x = 1,651,549.58
  5. Step 5: Solve for x
    x = 1,651,549.58/1,209.26
  6. Step 6: Final answer
    x = 1,365.75

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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.