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Finding the Fourth Proportional to 1,141.26, 1,574.76 and 643.83

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Solution

The fourth proportional to 1,141.26, 1,574.76 and 643.83 is: 888.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.26 : 1,574.76 = 643.83 : x
  2. Step 2: Convert to fraction form
    1,141.26/1,574.76 = 643.83/x
  3. Step 3: Cross multiply
    1,141.26x = 1,574.76 × 643.83
  4. Step 4: Simplify right side
    1,141.26x = 1,013,877.73
  5. Step 5: Solve for x
    x = 1,013,877.73/1,141.26
  6. Step 6: Final answer
    x = 888.38

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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.