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Finding the Fourth Proportional to 710.60, 980.61 and 395.85

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Solution

The fourth proportional to 710.60, 980.61 and 395.85 is: 546.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.60 : 980.61 = 395.85 : x
  2. Step 2: Convert to fraction form
    710.60/980.61 = 395.85/x
  3. Step 3: Cross multiply
    710.60x = 980.61 × 395.85
  4. Step 4: Simplify right side
    710.60x = 388,174.47
  5. Step 5: Solve for x
    x = 388,174.47/710.60
  6. Step 6: Final answer
    x = 546.26

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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.