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Finding the Fourth Proportional to 949.87, 1,310.81 and 669.81

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Solution

The fourth proportional to 949.87, 1,310.81 and 669.81 is: 924.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.87 : 1,310.81 = 669.81 : x
  2. Step 2: Convert to fraction form
    949.87/1,310.81 = 669.81/x
  3. Step 3: Cross multiply
    949.87x = 1,310.81 × 669.81
  4. Step 4: Simplify right side
    949.87x = 877,990.30
  5. Step 5: Solve for x
    x = 877,990.30/949.87
  6. Step 6: Final answer
    x = 924.33

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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.