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Finding the Fourth Proportional to 717.70, 1,076.58 and 428.50

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Solution

The fourth proportional to 717.70, 1,076.58 and 428.50 is: 642.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.70 : 1,076.58 = 428.50 : x
  2. Step 2: Convert to fraction form
    717.70/1,076.58 = 428.50/x
  3. Step 3: Cross multiply
    717.70x = 1,076.58 × 428.50
  4. Step 4: Simplify right side
    717.70x = 461,314.53
  5. Step 5: Solve for x
    x = 461,314.53/717.70
  6. Step 6: Final answer
    x = 642.77

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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.