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Finding the Fourth Proportional to 949.12, 1,423.17 and 486.71

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Solution

The fourth proportional to 949.12, 1,423.17 and 486.71 is: 729.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.12 : 1,423.17 = 486.71 : x
  2. Step 2: Convert to fraction form
    949.12/1,423.17 = 486.71/x
  3. Step 3: Cross multiply
    949.12x = 1,423.17 × 486.71
  4. Step 4: Simplify right side
    949.12x = 692,669.29
  5. Step 5: Solve for x
    x = 692,669.29/949.12
  6. Step 6: Final answer
    x = 729.80

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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.