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Finding the Fourth Proportional to 1,391.49, 1,920.28 and 762.01

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Solution

The fourth proportional to 1,391.49, 1,920.28 and 762.01 is: 1,051.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.49 : 1,920.28 = 762.01 : x
  2. Step 2: Convert to fraction form
    1,391.49/1,920.28 = 762.01/x
  3. Step 3: Cross multiply
    1,391.49x = 1,920.28 × 762.01
  4. Step 4: Simplify right side
    1,391.49x = 1,463,268.71
  5. Step 5: Solve for x
    x = 1,463,268.71/1,391.49
  6. Step 6: Final answer
    x = 1,051.58

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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.