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Finding the Fourth Proportional to 910.39, 1,256.31 and 496.39

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Solution

The fourth proportional to 910.39, 1,256.31 and 496.39 is: 685.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.39 : 1,256.31 = 496.39 : x
  2. Step 2: Convert to fraction form
    910.39/1,256.31 = 496.39/x
  3. Step 3: Cross multiply
    910.39x = 1,256.31 × 496.39
  4. Step 4: Simplify right side
    910.39x = 623,619.72
  5. Step 5: Solve for x
    x = 623,619.72/910.39
  6. Step 6: Final answer
    x = 685.00

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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.