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Finding the Fourth Proportional to 874.03, 1,310.84 and 386.81

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Solution

The fourth proportional to 874.03, 1,310.84 and 386.81 is: 580.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.03 : 1,310.84 = 386.81 : x
  2. Step 2: Convert to fraction form
    874.03/1,310.84 = 386.81/x
  3. Step 3: Cross multiply
    874.03x = 1,310.84 × 386.81
  4. Step 4: Simplify right side
    874.03x = 507,044.09
  5. Step 5: Solve for x
    x = 507,044.09/874.03
  6. Step 6: Final answer
    x = 580.12

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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.