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Finding the Fourth Proportional to 1,207.40, 1,665.82 and 710.16

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Solution

The fourth proportional to 1,207.40, 1,665.82 and 710.16 is: 979.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.40 : 1,665.82 = 710.16 : x
  2. Step 2: Convert to fraction form
    1,207.40/1,665.82 = 710.16/x
  3. Step 3: Cross multiply
    1,207.40x = 1,665.82 × 710.16
  4. Step 4: Simplify right side
    1,207.40x = 1,182,998.73
  5. Step 5: Solve for x
    x = 1,182,998.73/1,207.40
  6. Step 6: Final answer
    x = 979.79

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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.