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Finding the Fourth Proportional to 1,142.23, 1,576.35 and 644.69

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Solution

The fourth proportional to 1,142.23, 1,576.35 and 644.69 is: 889.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.23 : 1,576.35 = 644.69 : x
  2. Step 2: Convert to fraction form
    1,142.23/1,576.35 = 644.69/x
  3. Step 3: Cross multiply
    1,142.23x = 1,576.35 × 644.69
  4. Step 4: Simplify right side
    1,142.23x = 1,016,257.08
  5. Step 5: Solve for x
    x = 1,016,257.08/1,142.23
  6. Step 6: Final answer
    x = 889.71

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Half scale
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Double scale
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1.5x scale

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.