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Finding the Fourth Proportional to 910.64, 1,256.66 and 496.64

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Solution

The fourth proportional to 910.64, 1,256.66 and 496.64 is: 685.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.64 : 1,256.66 = 496.64 : x
  2. Step 2: Convert to fraction form
    910.64/1,256.66 = 496.64/x
  3. Step 3: Cross multiply
    910.64x = 1,256.66 × 496.64
  4. Step 4: Simplify right side
    910.64x = 624,107.62
  5. Step 5: Solve for x
    x = 624,107.62/910.64
  6. Step 6: Final answer
    x = 685.35

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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.