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Finding the Fourth Proportional to 1,391.55, 1,920.36 and 949.45

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Solution

The fourth proportional to 1,391.55, 1,920.36 and 949.45 is: 1,310.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.55 : 1,920.36 = 949.45 : x
  2. Step 2: Convert to fraction form
    1,391.55/1,920.36 = 949.45/x
  3. Step 3: Cross multiply
    1,391.55x = 1,920.36 × 949.45
  4. Step 4: Simplify right side
    1,391.55x = 1,823,277.42
  5. Step 5: Solve for x
    x = 1,823,277.42/1,391.55
  6. Step 6: Final answer
    x = 1,310.24

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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.