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Finding the Fourth Proportional to 910.38, 1,255.58 and 611.68

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Solution

The fourth proportional to 910.38, 1,255.58 and 611.68 is: 843.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.38 : 1,255.58 = 611.68 : x
  2. Step 2: Convert to fraction form
    910.38/1,255.58 = 611.68/x
  3. Step 3: Cross multiply
    910.38x = 1,255.58 × 611.68
  4. Step 4: Simplify right side
    910.38x = 768,013.17
  5. Step 5: Solve for x
    x = 768,013.17/910.38
  6. Step 6: Final answer
    x = 843.62

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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.