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Finding the Fourth Proportional to 910.63, 1,256.68 and 496.63

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Solution

The fourth proportional to 910.63, 1,256.68 and 496.63 is: 685.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.63 : 1,256.68 = 496.63 : x
  2. Step 2: Convert to fraction form
    910.63/1,256.68 = 496.63/x
  3. Step 3: Cross multiply
    910.63x = 1,256.68 × 496.63
  4. Step 4: Simplify right side
    910.63x = 624,097.46
  5. Step 5: Solve for x
    x = 624,097.46/910.63
  6. Step 6: Final answer
    x = 685.35

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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.