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Finding the Fourth Proportional to 710.55, 980.60 and 395.88

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Solution

The fourth proportional to 710.55, 980.60 and 395.88 is: 546.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.55 : 980.60 = 395.88 : x
  2. Step 2: Convert to fraction form
    710.55/980.60 = 395.88/x
  3. Step 3: Cross multiply
    710.55x = 980.60 × 395.88
  4. Step 4: Simplify right side
    710.55x = 388,199.93
  5. Step 5: Solve for x
    x = 388,199.93/710.55
  6. Step 6: Final answer
    x = 546.34

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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.