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Finding the Fourth Proportional to 911.07, 1,256.97 and 512.76

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Solution

The fourth proportional to 911.07, 1,256.97 and 512.76 is: 707.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.07 : 1,256.97 = 512.76 : x
  2. Step 2: Convert to fraction form
    911.07/1,256.97 = 512.76/x
  3. Step 3: Cross multiply
    911.07x = 1,256.97 × 512.76
  4. Step 4: Simplify right side
    911.07x = 644,523.94
  5. Step 5: Solve for x
    x = 644,523.94/911.07
  6. Step 6: Final answer
    x = 707.44

Related Problems

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Half scale
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Double scale
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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.