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Finding the Fourth Proportional to 1,207.08, 1,665.36 and 709.56

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Solution

The fourth proportional to 1,207.08, 1,665.36 and 709.56 is: 978.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.08 : 1,665.36 = 709.56 : x
  2. Step 2: Convert to fraction form
    1,207.08/1,665.36 = 709.56/x
  3. Step 3: Cross multiply
    1,207.08x = 1,665.36 × 709.56
  4. Step 4: Simplify right side
    1,207.08x = 1,181,672.84
  5. Step 5: Solve for x
    x = 1,181,672.84/1,207.08
  6. Step 6: Final answer
    x = 978.95

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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.