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Finding the Fourth Proportional to 1,141.46, 1,575.21 and 644.10

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Solution

The fourth proportional to 1,141.46, 1,575.21 and 644.10 is: 888.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.46 : 1,575.21 = 644.10 : x
  2. Step 2: Convert to fraction form
    1,141.46/1,575.21 = 644.10/x
  3. Step 3: Cross multiply
    1,141.46x = 1,575.21 × 644.10
  4. Step 4: Simplify right side
    1,141.46x = 1,014,586.50
  5. Step 5: Solve for x
    x = 1,014,586.50/1,141.46
  6. Step 6: Final answer
    x = 888.85

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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.