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Finding the Fourth Proportional to 910.40, 1,366.30 and 423.80

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Solution

The fourth proportional to 910.40, 1,366.30 and 423.80 is: 636.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.40 : 1,366.30 = 423.80 : x
  2. Step 2: Convert to fraction form
    910.40/1,366.30 = 423.80/x
  3. Step 3: Cross multiply
    910.40x = 1,366.30 × 423.80
  4. Step 4: Simplify right side
    910.40x = 579,037.94
  5. Step 5: Solve for x
    x = 579,037.94/910.40
  6. Step 6: Final answer
    x = 636.03

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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.