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Finding the Fourth Proportional to 874.38, 1,308.74 and 643.22

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Solution

The fourth proportional to 874.38, 1,308.74 and 643.22 is: 962.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.38 : 1,308.74 = 643.22 : x
  2. Step 2: Convert to fraction form
    874.38/1,308.74 = 643.22/x
  3. Step 3: Cross multiply
    874.38x = 1,308.74 × 643.22
  4. Step 4: Simplify right side
    874.38x = 841,797.98
  5. Step 5: Solve for x
    x = 841,797.98/874.38
  6. Step 6: Final answer
    x = 962.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.