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Finding the Fourth Proportional to 948.21, 1,309.33 and 669.07

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Solution

The fourth proportional to 948.21, 1,309.33 and 669.07 is: 923.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.21 : 1,309.33 = 669.07 : x
  2. Step 2: Convert to fraction form
    948.21/1,309.33 = 669.07/x
  3. Step 3: Cross multiply
    948.21x = 1,309.33 × 669.07
  4. Step 4: Simplify right side
    948.21x = 876,028.53
  5. Step 5: Solve for x
    x = 876,028.53/948.21
  6. Step 6: Final answer
    x = 923.87

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1.5x scale

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.