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Finding the Fourth Proportional to 1,218.26, 1,681.18 and 666.26

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Solution

The fourth proportional to 1,218.26, 1,681.18 and 666.26 is: 919.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.26 : 1,681.18 = 666.26 : x
  2. Step 2: Convert to fraction form
    1,218.26/1,681.18 = 666.26/x
  3. Step 3: Cross multiply
    1,218.26x = 1,681.18 × 666.26
  4. Step 4: Simplify right side
    1,218.26x = 1,120,102.99
  5. Step 5: Solve for x
    x = 1,120,102.99/1,218.26
  6. Step 6: Final answer
    x = 919.43

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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.