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Finding the Fourth Proportional to 911.46, 1,257.53 and 557.58

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Solution

The fourth proportional to 911.46, 1,257.53 and 557.58 is: 769.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.46 : 1,257.53 = 557.58 : x
  2. Step 2: Convert to fraction form
    911.46/1,257.53 = 557.58/x
  3. Step 3: Cross multiply
    911.46x = 1,257.53 × 557.58
  4. Step 4: Simplify right side
    911.46x = 701,170.79
  5. Step 5: Solve for x
    x = 701,170.79/911.46
  6. Step 6: Final answer
    x = 769.28

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1.5x scale

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.