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Finding the Fourth Proportional to 1,387.01, 1,913.94 and 757.49

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Solution

The fourth proportional to 1,387.01, 1,913.94 and 757.49 is: 1,045.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.01 : 1,913.94 = 757.49 : x
  2. Step 2: Convert to fraction form
    1,387.01/1,913.94 = 757.49/x
  3. Step 3: Cross multiply
    1,387.01x = 1,913.94 × 757.49
  4. Step 4: Simplify right side
    1,387.01x = 1,449,780.84
  5. Step 5: Solve for x
    x = 1,449,780.84/1,387.01
  6. Step 6: Final answer
    x = 1,045.26

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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.