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Finding the Fourth Proportional to 707.94, 976.97 and 428.13

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Solution

The fourth proportional to 707.94, 976.97 and 428.13 is: 590.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.94 : 976.97 = 428.13 : x
  2. Step 2: Convert to fraction form
    707.94/976.97 = 428.13/x
  3. Step 3: Cross multiply
    707.94x = 976.97 × 428.13
  4. Step 4: Simplify right side
    707.94x = 418,271.24
  5. Step 5: Solve for x
    x = 418,271.24/707.94
  6. Step 6: Final answer
    x = 590.83

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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.