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Finding the Fourth Proportional to 1,142.10, 1,575.98 and 644.64

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Solution

The fourth proportional to 1,142.10, 1,575.98 and 644.64 is: 889.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.10 : 1,575.98 = 644.64 : x
  2. Step 2: Convert to fraction form
    1,142.10/1,575.98 = 644.64/x
  3. Step 3: Cross multiply
    1,142.10x = 1,575.98 × 644.64
  4. Step 4: Simplify right side
    1,142.10x = 1,015,939.75
  5. Step 5: Solve for x
    x = 1,015,939.75/1,142.10
  6. Step 6: Final answer
    x = 889.54

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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.