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Finding the Fourth Proportional to 710.13, 979.97 and 399.63

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Solution

The fourth proportional to 710.13, 979.97 and 399.63 is: 551.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.13 : 979.97 = 399.63 : x
  2. Step 2: Convert to fraction form
    710.13/979.97 = 399.63/x
  3. Step 3: Cross multiply
    710.13x = 979.97 × 399.63
  4. Step 4: Simplify right side
    710.13x = 391,625.41
  5. Step 5: Solve for x
    x = 391,625.41/710.13
  6. Step 6: Final answer
    x = 551.48

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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.