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Finding the Fourth Proportional to 1,381.51, 2,072.40 and 515.89

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Solution

The fourth proportional to 1,381.51, 2,072.40 and 515.89 is: 773.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.51 : 2,072.40 = 515.89 : x
  2. Step 2: Convert to fraction form
    1,381.51/2,072.40 = 515.89/x
  3. Step 3: Cross multiply
    1,381.51x = 2,072.40 × 515.89
  4. Step 4: Simplify right side
    1,381.51x = 1,069,130.44
  5. Step 5: Solve for x
    x = 1,069,130.44/1,381.51
  6. Step 6: Final answer
    x = 773.89

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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.