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Finding the Fourth Proportional to 722.52, 997.08 and 390.95

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Solution

The fourth proportional to 722.52, 997.08 and 390.95 is: 539.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.52 : 997.08 = 390.95 : x
  2. Step 2: Convert to fraction form
    722.52/997.08 = 390.95/x
  3. Step 3: Cross multiply
    722.52x = 997.08 × 390.95
  4. Step 4: Simplify right side
    722.52x = 389,808.43
  5. Step 5: Solve for x
    x = 389,808.43/722.52
  6. Step 6: Final answer
    x = 539.51

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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.