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Finding the Fourth Proportional to 1,141.16, 1,574.82 and 643.75

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Solution

The fourth proportional to 1,141.16, 1,574.82 and 643.75 is: 888.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.16 : 1,574.82 = 643.75 : x
  2. Step 2: Convert to fraction form
    1,141.16/1,574.82 = 643.75/x
  3. Step 3: Cross multiply
    1,141.16x = 1,574.82 × 643.75
  4. Step 4: Simplify right side
    1,141.16x = 1,013,786.44
  5. Step 5: Solve for x
    x = 1,013,786.44/1,141.16
  6. Step 6: Final answer
    x = 888.39

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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.