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Finding the Fourth Proportional to 874.80, 1,311.36 and 435.84

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Solution

The fourth proportional to 874.80, 1,311.36 and 435.84 is: 653.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,311.36 = 435.84 : x
  2. Step 2: Convert to fraction form
    874.80/1,311.36 = 435.84/x
  3. Step 3: Cross multiply
    874.80x = 1,311.36 × 435.84
  4. Step 4: Simplify right side
    874.80x = 571,543.14
  5. Step 5: Solve for x
    x = 571,543.14/874.80
  6. Step 6: Final answer
    x = 653.34

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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.