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Finding the Fourth Proportional to 710.37, 980.31 and 399.87

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Solution

The fourth proportional to 710.37, 980.31 and 399.87 is: 551.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.37 : 980.31 = 399.87 : x
  2. Step 2: Convert to fraction form
    710.37/980.31 = 399.87/x
  3. Step 3: Cross multiply
    710.37x = 980.31 × 399.87
  4. Step 4: Simplify right side
    710.37x = 391,998.06
  5. Step 5: Solve for x
    x = 391,998.06/710.37
  6. Step 6: Final answer
    x = 551.82

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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.