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Finding the Fourth Proportional to 1,296.69, 1,789.43 and 707.21

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Solution

The fourth proportional to 1,296.69, 1,789.43 and 707.21 is: 975.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.69 : 1,789.43 = 707.21 : x
  2. Step 2: Convert to fraction form
    1,296.69/1,789.43 = 707.21/x
  3. Step 3: Cross multiply
    1,296.69x = 1,789.43 × 707.21
  4. Step 4: Simplify right side
    1,296.69x = 1,265,497.02
  5. Step 5: Solve for x
    x = 1,265,497.02/1,296.69
  6. Step 6: Final answer
    x = 975.95

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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.