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Finding the Fourth Proportional to 709.30, 978.01 and 649.77

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Solution

The fourth proportional to 709.30, 978.01 and 649.77 is: 895.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.30 : 978.01 = 649.77 : x
  2. Step 2: Convert to fraction form
    709.30/978.01 = 649.77/x
  3. Step 3: Cross multiply
    709.30x = 978.01 × 649.77
  4. Step 4: Simplify right side
    709.30x = 635,481.56
  5. Step 5: Solve for x
    x = 635,481.56/709.30
  6. Step 6: Final answer
    x = 895.93

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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.