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Finding the Fourth Proportional to 722.97, 997.70 and 391.40

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Solution

The fourth proportional to 722.97, 997.70 and 391.40 is: 540.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.97 : 997.70 = 391.40 : x
  2. Step 2: Convert to fraction form
    722.97/997.70 = 391.40/x
  3. Step 3: Cross multiply
    722.97x = 997.70 × 391.40
  4. Step 4: Simplify right side
    722.97x = 390,492.83
  5. Step 5: Solve for x
    x = 390,492.83/722.97
  6. Step 6: Final answer
    x = 540.12

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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.