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Finding the Fourth Proportional to 874.13, 1,311.39 and 297

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Solution

The fourth proportional to 874.13, 1,311.39 and 297 is: 445.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.13 : 1,311.39 = 297 : x
  2. Step 2: Convert to fraction form
    874.13/1,311.39 = 297/x
  3. Step 3: Cross multiply
    874.13x = 1,311.39 × 297
  4. Step 4: Simplify right side
    874.13x = 389,482.83
  5. Step 5: Solve for x
    x = 389,482.83/874.13
  6. Step 6: Final answer
    x = 445.57

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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.