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Finding the Fourth Proportional to 1,296.87, 1,789.72 and 707.45

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Solution

The fourth proportional to 1,296.87, 1,789.72 and 707.45 is: 976.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.87 : 1,789.72 = 707.45 : x
  2. Step 2: Convert to fraction form
    1,296.87/1,789.72 = 707.45/x
  3. Step 3: Cross multiply
    1,296.87x = 1,789.72 × 707.45
  4. Step 4: Simplify right side
    1,296.87x = 1,266,140.12
  5. Step 5: Solve for x
    x = 1,266,140.12/1,296.87
  6. Step 6: Final answer
    x = 976.30

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1.5x scale

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.