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Finding the Fourth Proportional to 1,392.19, 1,921.21 and 762.71

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Solution

The fourth proportional to 1,392.19, 1,921.21 and 762.71 is: 1,052.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.19 : 1,921.21 = 762.71 : x
  2. Step 2: Convert to fraction form
    1,392.19/1,921.21 = 762.71/x
  3. Step 3: Cross multiply
    1,392.19x = 1,921.21 × 762.71
  4. Step 4: Simplify right side
    1,392.19x = 1,465,331.84
  5. Step 5: Solve for x
    x = 1,465,331.84/1,392.19
  6. Step 6: Final answer
    x = 1,052.54

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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.