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Finding the Fourth Proportional to 1,207.05, 1,665.40 and 709.51

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Solution

The fourth proportional to 1,207.05, 1,665.40 and 709.51 is: 978.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.05 : 1,665.40 = 709.51 : x
  2. Step 2: Convert to fraction form
    1,207.05/1,665.40 = 709.51/x
  3. Step 3: Cross multiply
    1,207.05x = 1,665.40 × 709.51
  4. Step 4: Simplify right side
    1,207.05x = 1,181,617.95
  5. Step 5: Solve for x
    x = 1,181,617.95/1,207.05
  6. Step 6: Final answer
    x = 978.93

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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.