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Finding the Fourth Proportional to 910.74, 1,256.91 and 556.64

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Solution

The fourth proportional to 910.74, 1,256.91 and 556.64 is: 768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.74 : 1,256.91 = 556.64 : x
  2. Step 2: Convert to fraction form
    910.74/1,256.91 = 556.64/x
  3. Step 3: Cross multiply
    910.74x = 1,256.91 × 556.64
  4. Step 4: Simplify right side
    910.74x = 699,640.10
  5. Step 5: Solve for x
    x = 699,640.10/910.74
  6. Step 6: Final answer
    x = 768.21

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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.