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Finding the Fourth Proportional to 1,207.17, 1,665.63 and 959.31

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Solution

The fourth proportional to 1,207.17, 1,665.63 and 959.31 is: 1,323.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.17 : 1,665.63 = 959.31 : x
  2. Step 2: Convert to fraction form
    1,207.17/1,665.63 = 959.31/x
  3. Step 3: Cross multiply
    1,207.17x = 1,665.63 × 959.31
  4. Step 4: Simplify right side
    1,207.17x = 1,597,855.52
  5. Step 5: Solve for x
    x = 1,597,855.52/1,207.17
  6. Step 6: Final answer
    x = 1,323.64

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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.