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Finding the Fourth Proportional to 910.64, 1,364.88 and 422.66

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Solution

The fourth proportional to 910.64, 1,364.88 and 422.66 is: 633.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.64 : 1,364.88 = 422.66 : x
  2. Step 2: Convert to fraction form
    910.64/1,364.88 = 422.66/x
  3. Step 3: Cross multiply
    910.64x = 1,364.88 × 422.66
  4. Step 4: Simplify right side
    910.64x = 576,880.18
  5. Step 5: Solve for x
    x = 576,880.18/910.64
  6. Step 6: Final answer
    x = 633.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.