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Finding the Fourth Proportional to 624.70, 862.26 and 428.18

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Solution

The fourth proportional to 624.70, 862.26 and 428.18 is: 591.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.70 : 862.26 = 428.18 : x
  2. Step 2: Convert to fraction form
    624.70/862.26 = 428.18/x
  3. Step 3: Cross multiply
    624.70x = 862.26 × 428.18
  4. Step 4: Simplify right side
    624.70x = 369,202.49
  5. Step 5: Solve for x
    x = 369,202.49/624.70
  6. Step 6: Final answer
    x = 591.01

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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.