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Finding the Fourth Proportional to 710.38, 980.30 and 395.64

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Solution

The fourth proportional to 710.38, 980.30 and 395.64 is: 545.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.38 : 980.30 = 395.64 : x
  2. Step 2: Convert to fraction form
    710.38/980.30 = 395.64/x
  3. Step 3: Cross multiply
    710.38x = 980.30 × 395.64
  4. Step 4: Simplify right side
    710.38x = 387,845.89
  5. Step 5: Solve for x
    x = 387,845.89/710.38
  6. Step 6: Final answer
    x = 545.97

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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.