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Finding the Fourth Proportional to 910.25, 1,256.28 and 556.28

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Solution

The fourth proportional to 910.25, 1,256.28 and 556.28 is: 767.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.25 : 1,256.28 = 556.28 : x
  2. Step 2: Convert to fraction form
    910.25/1,256.28 = 556.28/x
  3. Step 3: Cross multiply
    910.25x = 1,256.28 × 556.28
  4. Step 4: Simplify right side
    910.25x = 698,843.44
  5. Step 5: Solve for x
    x = 698,843.44/910.25
  6. Step 6: Final answer
    x = 767.75

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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.