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Finding the Fourth Proportional to 1,368.47, 2,052.67 and 381.28

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Solution

The fourth proportional to 1,368.47, 2,052.67 and 381.28 is: 571.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.47 : 2,052.67 = 381.28 : x
  2. Step 2: Convert to fraction form
    1,368.47/2,052.67 = 381.28/x
  3. Step 3: Cross multiply
    1,368.47x = 2,052.67 × 381.28
  4. Step 4: Simplify right side
    1,368.47x = 782,642.02
  5. Step 5: Solve for x
    x = 782,642.02/1,368.47
  6. Step 6: Final answer
    x = 571.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.