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Finding the Fourth Proportional to 806.81, 1,113.35 and 475.21

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Solution

The fourth proportional to 806.81, 1,113.35 and 475.21 is: 655.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.81 : 1,113.35 = 475.21 : x
  2. Step 2: Convert to fraction form
    806.81/1,113.35 = 475.21/x
  3. Step 3: Cross multiply
    806.81x = 1,113.35 × 475.21
  4. Step 4: Simplify right side
    806.81x = 529,074.07
  5. Step 5: Solve for x
    x = 529,074.07/806.81
  6. Step 6: Final answer
    x = 655.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.