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Finding the Fourth Proportional to 561.99, 775.71 and 422.58

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Solution

The fourth proportional to 561.99, 775.71 and 422.58 is: 583.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.99 : 775.71 = 422.58 : x
  2. Step 2: Convert to fraction form
    561.99/775.71 = 422.58/x
  3. Step 3: Cross multiply
    561.99x = 775.71 × 422.58
  4. Step 4: Simplify right side
    561.99x = 327,799.53
  5. Step 5: Solve for x
    x = 327,799.53/561.99
  6. Step 6: Final answer
    x = 583.28

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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.