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Finding the Fourth Proportional to 806.16, 1,209.48 and 517.80

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Solution

The fourth proportional to 806.16, 1,209.48 and 517.80 is: 776.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.16 : 1,209.48 = 517.80 : x
  2. Step 2: Convert to fraction form
    806.16/1,209.48 = 517.80/x
  3. Step 3: Cross multiply
    806.16x = 1,209.48 × 517.80
  4. Step 4: Simplify right side
    806.16x = 626,268.74
  5. Step 5: Solve for x
    x = 626,268.74/806.16
  6. Step 6: Final answer
    x = 776.85

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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.