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Finding the Fourth Proportional to 1,141.34, 1,575 and 644.03

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Solution

The fourth proportional to 1,141.34, 1,575 and 644.03 is: 888.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.34 : 1,575 = 644.03 : x
  2. Step 2: Convert to fraction form
    1,141.34/1,575 = 644.03/x
  3. Step 3: Cross multiply
    1,141.34x = 1,575 × 644.03
  4. Step 4: Simplify right side
    1,141.34x = 1,014,339.38
  5. Step 5: Solve for x
    x = 1,014,339.38/1,141.34
  6. Step 6: Final answer
    x = 888.72

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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.