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Finding the Fourth Proportional to 1,206.45, 1,665.45 and 709.13

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Solution

The fourth proportional to 1,206.45, 1,665.45 and 709.13 is: 978.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.45 : 1,665.45 = 709.13 : x
  2. Step 2: Convert to fraction form
    1,206.45/1,665.45 = 709.13/x
  3. Step 3: Cross multiply
    1,206.45x = 1,665.45 × 709.13
  4. Step 4: Simplify right side
    1,206.45x = 1,181,020.56
  5. Step 5: Solve for x
    x = 1,181,020.56/1,206.45
  6. Step 6: Final answer
    x = 978.92

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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.