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Finding the Fourth Proportional to 948.49, 1,309.16 and 668.81

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Solution

The fourth proportional to 948.49, 1,309.16 and 668.81 is: 923.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.49 : 1,309.16 = 668.81 : x
  2. Step 2: Convert to fraction form
    948.49/1,309.16 = 668.81/x
  3. Step 3: Cross multiply
    948.49x = 1,309.16 × 668.81
  4. Step 4: Simplify right side
    948.49x = 875,574.43
  5. Step 5: Solve for x
    x = 875,574.43/948.49
  6. Step 6: Final answer
    x = 923.13

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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.