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Finding the Fourth Proportional to 1,391.54, 1,920.35 and 762.06

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Solution

The fourth proportional to 1,391.54, 1,920.35 and 762.06 is: 1,051.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.54 : 1,920.35 = 762.06 : x
  2. Step 2: Convert to fraction form
    1,391.54/1,920.35 = 762.06/x
  3. Step 3: Cross multiply
    1,391.54x = 1,920.35 × 762.06
  4. Step 4: Simplify right side
    1,391.54x = 1,463,418.08
  5. Step 5: Solve for x
    x = 1,463,418.08/1,391.54
  6. Step 6: Final answer
    x = 1,051.65

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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.