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Finding the Fourth Proportional to 874.07, 1,305.05 and 865.30

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Solution

The fourth proportional to 874.07, 1,305.05 and 865.30 is: 1,291.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.07 : 1,305.05 = 865.30 : x
  2. Step 2: Convert to fraction form
    874.07/1,305.05 = 865.30/x
  3. Step 3: Cross multiply
    874.07x = 1,305.05 × 865.30
  4. Step 4: Simplify right side
    874.07x = 1,129,254.62
  5. Step 5: Solve for x
    x = 1,129,254.62/874.07
  6. Step 6: Final answer
    x = 1,291.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.