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Finding the Fourth Proportional to 722.49, 997.03 and 390.91

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Solution

The fourth proportional to 722.49, 997.03 and 390.91 is: 539.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.49 : 997.03 = 390.91 : x
  2. Step 2: Convert to fraction form
    722.49/997.03 = 390.91/x
  3. Step 3: Cross multiply
    722.49x = 997.03 × 390.91
  4. Step 4: Simplify right side
    722.49x = 389,753.22
  5. Step 5: Solve for x
    x = 389,753.22/722.49
  6. Step 6: Final answer
    x = 539.46

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1.5x scale

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.