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Finding the Fourth Proportional to 1,206.58, 1,665.38 and 709.55

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Solution

The fourth proportional to 1,206.58, 1,665.38 and 709.55 is: 979.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.58 : 1,665.38 = 709.55 : x
  2. Step 2: Convert to fraction form
    1,206.58/1,665.38 = 709.55/x
  3. Step 3: Cross multiply
    1,206.58x = 1,665.38 × 709.55
  4. Step 4: Simplify right side
    1,206.58x = 1,181,670.38
  5. Step 5: Solve for x
    x = 1,181,670.38/1,206.58
  6. Step 6: Final answer
    x = 979.36

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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.