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Finding the Fourth Proportional to 771.84, 1,065.20 and 422.56

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Solution

The fourth proportional to 771.84, 1,065.20 and 422.56 is: 583.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.84 : 1,065.20 = 422.56 : x
  2. Step 2: Convert to fraction form
    771.84/1,065.20 = 422.56/x
  3. Step 3: Cross multiply
    771.84x = 1,065.20 × 422.56
  4. Step 4: Simplify right side
    771.84x = 450,110.91
  5. Step 5: Solve for x
    x = 450,110.91/771.84
  6. Step 6: Final answer
    x = 583.17

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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.