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Finding the Fourth Proportional to 711.79, 982.28 and 397.06

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Solution

The fourth proportional to 711.79, 982.28 and 397.06 is: 547.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.79 : 982.28 = 397.06 : x
  2. Step 2: Convert to fraction form
    711.79/982.28 = 397.06/x
  3. Step 3: Cross multiply
    711.79x = 982.28 × 397.06
  4. Step 4: Simplify right side
    711.79x = 390,021.64
  5. Step 5: Solve for x
    x = 390,021.64/711.79
  6. Step 6: Final answer
    x = 547.95

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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.