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Finding the Fourth Proportional to 1,391.40, 1,919.64 and 894.30

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Solution

The fourth proportional to 1,391.40, 1,919.64 and 894.30 is: 1,233.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.40 : 1,919.64 = 894.30 : x
  2. Step 2: Convert to fraction form
    1,391.40/1,919.64 = 894.30/x
  3. Step 3: Cross multiply
    1,391.40x = 1,919.64 × 894.30
  4. Step 4: Simplify right side
    1,391.40x = 1,716,734.05
  5. Step 5: Solve for x
    x = 1,716,734.05/1,391.40
  6. Step 6: Final answer
    x = 1,233.82

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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.