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Finding the Fourth Proportional to 808.20, 1,211.58 and 375.88

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Solution

The fourth proportional to 808.20, 1,211.58 and 375.88 is: 563.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.20 : 1,211.58 = 375.88 : x
  2. Step 2: Convert to fraction form
    808.20/1,211.58 = 375.88/x
  3. Step 3: Cross multiply
    808.20x = 1,211.58 × 375.88
  4. Step 4: Simplify right side
    808.20x = 455,408.69
  5. Step 5: Solve for x
    x = 455,408.69/808.20
  6. Step 6: Final answer
    x = 563.49

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1.5x scale

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.