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Finding the Fourth Proportional to 1,209.36, 1,666.98 and 987.92

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Solution

The fourth proportional to 1,209.36, 1,666.98 and 987.92 is: 1,361.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.36 : 1,666.98 = 987.92 : x
  2. Step 2: Convert to fraction form
    1,209.36/1,666.98 = 987.92/x
  3. Step 3: Cross multiply
    1,209.36x = 1,666.98 × 987.92
  4. Step 4: Simplify right side
    1,209.36x = 1,646,842.88
  5. Step 5: Solve for x
    x = 1,646,842.88/1,209.36
  6. Step 6: Final answer
    x = 1,361.75

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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.