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Finding the Fourth Proportional to 1,017.44, 1,403.12 and 643.79

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Solution

The fourth proportional to 1,017.44, 1,403.12 and 643.79 is: 887.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.44 : 1,403.12 = 643.79 : x
  2. Step 2: Convert to fraction form
    1,017.44/1,403.12 = 643.79/x
  3. Step 3: Cross multiply
    1,017.44x = 1,403.12 × 643.79
  4. Step 4: Simplify right side
    1,017.44x = 903,304.39
  5. Step 5: Solve for x
    x = 903,304.39/1,017.44
  6. Step 6: Final answer
    x = 887.83

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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.