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Finding the Fourth Proportional to 506.55, 759.96 and 428.70

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Solution

The fourth proportional to 506.55, 759.96 and 428.70 is: 643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.55 : 759.96 = 428.70 : x
  2. Step 2: Convert to fraction form
    506.55/759.96 = 428.70/x
  3. Step 3: Cross multiply
    506.55x = 759.96 × 428.70
  4. Step 4: Simplify right side
    506.55x = 325,792.71
  5. Step 5: Solve for x
    x = 325,792.71/506.55
  6. Step 6: Final answer
    x = 643.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.