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Finding the Fourth Proportional to 710.60, 980.64 and 395.89

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Solution

The fourth proportional to 710.60, 980.64 and 395.89 is: 546.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.60 : 980.64 = 395.89 : x
  2. Step 2: Convert to fraction form
    710.60/980.64 = 395.89/x
  3. Step 3: Cross multiply
    710.60x = 980.64 × 395.89
  4. Step 4: Simplify right side
    710.60x = 388,220.67
  5. Step 5: Solve for x
    x = 388,220.67/710.60
  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.