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Finding the Fourth Proportional to 710.61, 980.60 and 395.90

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Solution

The fourth proportional to 710.61, 980.60 and 395.90 is: 546.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.61 : 980.60 = 395.90 : x
  2. Step 2: Convert to fraction form
    710.61/980.60 = 395.90/x
  3. Step 3: Cross multiply
    710.61x = 980.60 × 395.90
  4. Step 4: Simplify right side
    710.61x = 388,224.44
  5. Step 5: Solve for x
    x = 388,224.44/710.61
  6. Step 6: Final answer
    x = 546.33

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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.